Last updated September 9, 2026 · By Nick Hall. New to the gun itself? Start with our Glock 43X review.
The Glock 43X aftermarket changed in 2026 and most upgrade lists have not caught up. For six years the whole platform was defined by one third-party part, the Shield Arms S15, because it was the only way to get fifteen rounds into a slimline grip. GLOCK now makes its own fifteen-round magazine for the 43X, and that single change reorders the list below.
What follows are the parts I would actually buy for a 43X, in the order I would buy them, with what each one costs right now at the retailers we track. Every card on this page was checked on the reader path before it shipped, so the prices you see are the prices a buyer sees.
Some of the links below are affiliate links, meaning at no additional cost to you, we may earn a commission if you click through and make a purchase.
Quick Answer: Buy a holster and one spare factory fifteen-round magazine first, which is about $101 together and covers most of what a carry gun needs. Then grip tape and night sights. A light and a red dot are the expensive steps, and the red dot needs the MOS slide. You no longer need the Shield Arms steel magazine catch to run fifteen rounds, because GLOCK designed the factory magazine around the standard polymer catch.
Table of Contents
How we tested: Every pick here is ranked against our testing methodology. Minimum round counts, accuracy and reliability protocols, the failures that disqualify a gun. Where we have not shot a specific variant ourselves, we say so in that section.
Glock 43X Upgrades at a Glance
| What it does | Our pick | Street price | Why it makes the list |
|---|---|---|---|
| Capacity | GLOCK factory 15-round magazine | About $35 | Fifteen rounds with the standard magazine catch, no other parts |
| Capacity, the older way | Shield Arms S15 | About $21 to $38 | Still the answer for older guns, and it takes a 5-round extension |
| Steel mag catch | Shield Arms 43X/48 catch | About $18 | Only needed if you run S15 steel magazines |
| Sights | XS Sights R3D | About $117 | Tritium front in a glowing ring, suppressor height for a dot |
| Red dot | Holosun 507K X2 | About $296 | The K footprint the 43X MOS slide is cut for |
| Light | Streamlight TLR-7 Sub | About $140 to $180 | Built for the slim rail, so it does not hang off the frame |
| Trigger | Overwatch Precision DAT | About $73 | Flat face, factory safeties untouched |
| Barrel | Zaffiri Precision | About $161 | Match grade, threaded if you want a can |
| Holster | Kydex IWB, molded to your setup | About $48 to $77 | The part that decides whether the gun gets carried at all |
| Grip | Talon Grips | About $25 | Cheapest change you will feel on every draw |
Prices are live retailer rows read on September 9, 2026, and they move. The cards further down the page carry the current numbers.
What Actually Fits a Glock 43X
The 43X is a Glock 43 slide sitting on a Glock 48 frame. Once you know that, the whole parts catalogue makes sense, and so do the mistakes people make buying from it.
GLOCK’s own specifications say it plainly. The G43X and the G48 both stand 5.04 inches high including the magazine and both are 1.10 inches wide. The G43 is 4.25 inches high and holds six rounds. Meanwhile the 43 and the 43X share a 6.06 inch slide, while the 48 runs 6.85 inches.
So anything that touches the grip crosses over between the 43X and the 48, and nothing crosses to the 43. Magazines, magwells, grip tape, magazine catches and holster shells all follow that line. Sights follow the slide instead, which is why an XS set listed for the 42, 43, 43X and 48 really does fit all of them.
Barrels follow neither. A 43X barrel is 3.41 inches and a 48 barrel is 4.17 inches, so a listing that reads “Glock 43/43X” is right and one that reads “43X/48” is not. Lights are the other trap. The 43X and the 48 have what GLOCK calls a slim mounting rail, and the plain 43 has no rail at all, so there is nowhere to hang a TLR-7 Sub.
1. GLOCK Factory 15-Round Magazine
- Fits: Glock 43X, 43X MOS, 48, 48 MOS
- Capacity: 15 rounds of 9mm, flush fit
- Build: Metal double stack body
- Street price: Around $30 to $35
| Capability gained | 5 / 5 |
| Ease of install | 5 / 5 |
| Value | 5 / 5 |
| Durability | 5 / 5 |
| Availability | 4 / 5 |
Pros
- Fifteen rounds, nothing else needed
- Keeps the standard polymer catch
- Cheaper than every aftermarket option
Cons
- Newer guns only in the box
- Stock levels still patchy in places
- No extension option like the S15
This is the part that rewrites every older 43X guide, including the version of this page that ran until today. GLOCK announced it at the 2026 NRA Annual Meetings: “OEM 15-round magazines for the G43X, G48, and G44 models are coming to a GLOCK dealer near you in May 2026”, and the G43X and G48 now ship with them as standard.
The detail that matters is not the capacity, it is the catch. GLOCK say the design “includes a radius in the magazine catch recess that allows customers to maintain the standard magazine catch”. Steel aftermarket magazines chew through the factory polymer catch over time, which is why an $18 steel catch has been mandatory reading on every 43X list for years. With the factory magazine that whole problem goes away.
So the honest recommendation for anyone buying a 43X today is to buy spare factory magazines rather than aftermarket ones. They are cheaper, they carry the same fifteen rounds, and they need no supporting parts. That is not a sentence I could have written eighteen months ago.
Best For: Every 43X and 48. Buy two spares and stop thinking about capacity.
2. Shield Arms S15 Magazine
- Fits: Glock 43X and 48, not the 43
- Capacity: 15 rounds, or 20 with the plus-five extension
- Build: Stainless steel body
- Street price: Around $21 to $38
| Capability gained | 5 / 5 |
| Ease of install | 4 / 5 |
| Value | 3 / 5 |
| Durability | 4 / 5 |
| Availability | 5 / 5 |
Pros
- Same fifteen rounds, widely stocked
- Takes a plus-five extension for twenty
- Proven over six years of carry
Cons
- Wants the steel catch fitted
- Costs more than the factory magazine
- Steel feed lips need breaking in
The S15 is not obsolete, it just is not the only answer any more. If your 43X predates the factory fifteen-rounder, or you already own a stack of them, there is no reason to replace anything. They work, they have worked for years, and Shield Arms have taken the design to a third generation.
There is also one thing the factory magazine cannot do. Shield Arms sell a five-round extension for the S15, which takes a carry gun to twenty rounds in the grip. For a nightstand 43X or a range gun that is a real advantage. For a pocket-thin carry gun it defeats the point of buying a 43X in the first place.
Buy the steel magazine catch at the same time if you go this route. That is not marketing, it is the wear problem the next section covers, and skipping it costs you more than the catch does.
Best For: Older 43X guns, and anyone who wants the twenty-round option.
3. Shield Arms Steel Magazine Catch
- Fits: Glock 43X and 48, a different part from the 43 catch
- Replaces: The factory polymer magazine catch
- Install: A punch and ten minutes, no gunsmith
- Street price: Around $11 to $18
| Capability gained | 3 / 5 |
| Ease of install | 4 / 5 |
| Value | 4 / 5 |
| Durability | 5 / 5 |
| Necessity | 2 / 5 |
Pros
- Stops steel magazines wearing the polymer
- Reversible, ambidextrous versions exist
- A ten minute job at home
Cons
- Pointless with factory magazines
- The Glock 43 part looks identical online
- Slightly stiffer release feel
Steel on polymer wins, slowly. Run S15 magazines against the factory catch for long enough and the catch rounds off, which shows up first as magazines that do not drop free and eventually as magazines that do not lock in. The steel catch is the fix, and it has been standard advice since the S15 launched.
It is also the part most likely to arrive wrong. Shield Arms make a catch for the Glock 43 and a catch for the 43X and 48, they look nearly identical in a listing photo, and retailers file both under one Shield Arms heading. Before I filtered the card above, the cheapest row on this search was a nine dollar Glock 43 catch. It is a real part, it is just not your part.
If you are running factory fifteen-round magazines, skip this entirely. GLOCK designed the new magazine to work with the catch already in your gun, and there is nothing left to protect.
Best For: S15 users only. Factory magazine owners can spend the money elsewhere.
4. XS Sights R3D Night Sights
- Fits: Glock 42, 43, 43X and 48
- Front: Tritium vial inside a photoluminescent ring
- Rear: Blacked out, notch only
- Street price: Around $102 to $117
| Capability gained | 5 / 5 |
| Ease of install | 2 / 5 |
| Value | 4 / 5 |
| Durability | 5 / 5 |
| Looks | 4 / 5 |
Pros
- A front sight you cannot miss
- Works in daylight and dark
- Suppressor height co-witnesses a dot
Cons
- Needs a sight pusher
- Big front dot covers distant targets
- Costs a quarter of the gun
Factory Glock sights are polymer, and on a gun you carry every day that is the wrong material in the wrong place. They are also a low-contrast white bracket, which is fine on a range and poor in a car park at ten at night.
The R3D solves it bluntly. A tritium vial sits inside a bright orange or green photoluminescent ring, so the front sight reads instantly in daylight, dusk and dark, and the rear stays black so your eye has nowhere else to go. It is not a precision target setup and it is not trying to be.
Buy the suppressor height version if there is any chance of a red dot later. It costs the same, it clears a 507K, and it means your irons still work when the dot does not. That is worth more than it sounds at three in the morning.
Best For: Any carried 43X. The first upgrade after a holster and a spare magazine.
5. Holosun 507K X2 Red Dot
- Fits: Glock 43X MOS and 48 MOS only
- Footprint: K pattern, not the full-size 507C
- Reticle: 2 MOA dot, 32 MOA circle, or both
- Street price: Around $296 to $370
| Capability gained | 5 / 5 |
| Ease of install | 4 / 5 |
| Value | 3 / 5 |
| Durability | 4 / 5 |
| Battery life | 5 / 5 |
Pros
- Sized right for a slimline slide
- Shake awake and solar backup
- Multi reticle suits any eyesight
Cons
- MOS slide or nothing
- The plate is a separate purchase
- More than half the gun
Two things go wrong when people buy a dot for a 43X. The first is footprint. The slimline slide is cut for the smaller K pattern, so a 507C will not go on no matter how much you want it to. The second is that you need the MOS slide at all, because a standard 43X has no optic cut and milling one costs more than the sight.
There is a third, and GLOCK state it themselves on the product page: “The G43X with the Modular Optic System (MOS) does not come with adapter plates.” Budget for the plate as well as the sight, and buy the one Holosun list for the K footprint rather than the one that looks close.
Once it is on, it does what dots do. Both eyes open, target focus, and a genuine gain in speed past about seven yards. The solar cell and shake awake between them mean the battery question mostly disappears.
Best For: A 43X MOS you shoot regularly. Skip it on a gun that lives in a safe.
6. Streamlight TLR-7 Sub
- Fits: Glock 43X and 48, rail and MOS versions
- Output: 500 lumens, with a 1,000 lumen HL-X option
- Note: The plain Glock 43 has no rail
- Street price: Around $140 to $180
| Capability gained | 5 / 5 |
| Ease of install | 5 / 5 |
| Value | 4 / 5 |
| Durability | 5 / 5 |
| Concealment cost | 3 / 5 |
Pros
- Built for the slim rail
- Does not overhang the frame
- Ambidextrous switching, easy one handed
Cons
- Needs a light bearing holster
- Several near identical sub variants
- Adds bulk to a thin gun
Identifying what you are pointing at is not optional, and a full-size TLR-7 on a slimline frame handles like a brick taped to a phone. The Sub was designed around this exact rail, so the light sits flush with the dust cover and the gun still holsters like a 43X.
Read the model name carefully before you buy. Streamlight sell a TLR-7 Sub, a TLR-7 X Sub and a TLR-7 HL-X Sub, and they also sell each of those in a SIG P365 rail pattern that will not fit your Glock. The card above filters the P365 versions out, which is exactly the kind of thing that gets bought by accident when the listing photo shows a generic black light.
One consequence people forget: a light-bearing gun needs a light-bearing holster. Add another sixty dollars or so, and check the holster is molded for your specific light before ordering.
Best For: A nightstand or home defence 43X, and anyone who carries after dark.
7. Overwatch Precision DAT Trigger
- Fits: Glock 43, 43X and 48
- Shape: Flat face with a positive stop
- Safeties: Factory trigger safety retained
- Street price: Around $73 to $99
| Capability gained | 3 / 5 |
| Ease of install | 3 / 5 |
| Value | 4 / 5 |
| Durability | 4 / 5 |
| Necessity | 2 / 5 |
Pros
- Consistent finger placement every press
- Cleaner break than the factory shoe
- Keeps the factory trigger safety
Cons
- Does not lighten the pull much
- The slide has to come off
- Least useful upgrade per dollar
The stock 43X trigger is not bad, it is vague. There is a long soft take-up, a break that moves around depending on where your finger sits, and enough slack afterwards that follow-up shots feel slower than they are.
A flat-faced shoe fixes the finger placement problem, which is most of the felt improvement. The Overwatch DAT gives you a defined stop and a far more repeatable break while leaving the trigger safety exactly where GLOCK put it, which matters on a gun you carry.
Be honest about where this sits, though. It is the seventh item on this list for a reason. A trigger will not make you shoot better than a holster you actually wear and a magazine you actually have with you, and plenty of 43X owners buy it second.
Best For: High round-count 43X owners who already have everything above.
8. Zaffiri Precision Barrel
- Fits: Glock 43 and 43X, 3.41 inch
- Options: Flush and crown, ported, or threaded
- Does not fit: The Glock 48, which uses a 4.17 inch barrel
- Street price: Around $161 to $170
| Capability gained | 3 / 5 |
| Ease of install | 5 / 5 |
| Value | 3 / 5 |
| Durability | 5 / 5 |
| Looks | 5 / 5 |
Pros
- Tighter groups than the factory barrel
- Threaded version opens up suppressors
- Drops in with no fitting
Cons
- Barely matters at carry distance
- Threaded needs taller sights
- Costs more than the trigger
A match barrel is the upgrade that photographs best and changes the least. On a 3.41 inch carry gun shot at seven yards, the factory GLOCK Marksman barrel is not what is limiting your groups. It is a genuine improvement, it is just an improvement at distances most people never shoot a 43X at.
Where it earns its place is threading. If you want a compensator or a suppressor on a slimline Glock, this is the only way in, and Zaffiri make the 43X barrel in flush and crown, ported and threaded forms with finishes that match a build.
Watch the length in the listing. Retailers file 43 and 43X barrels together, which is correct, but they also file 48 barrels alongside them, which is not. A 48 barrel is three quarters of an inch longer and will not go into your slide. The card above filters on length for that reason.
Best For: Suppressor and compensator builds, and people who shoot a 43X at distance.
9. Kydex IWB Holster
- Fits: Molded per configuration, never universal
- Carry: Inside the waistband, adjustable cant and retention
- Order for: Bare gun, optic cut, or light bearing
- Street price: Around $48 to $77
| Capability gained | 5 / 5 |
| Ease of install | 5 / 5 |
| Value | 5 / 5 |
| Durability | 4 / 5 |
| Comfort | 4 / 5 |
Pros
- Decides whether the gun gets carried
- Kydex keeps the trigger fully covered
- Adjustable cant fixes most comfort complaints
Cons
- One holster per gun configuration
- Break-in period on tight retention
- Cheap clips fail before the shell
This is the least exciting item on the page and the one I would buy first. A 43X in a drawer is a paperweight, and the single biggest reason people stop carrying is a holster that digs, prints or shifts through the day.
Buy for your exact setup. A shell molded for a bare 43X will not take an optic-cut slide or a TLR-7 Sub, and a universal holster is a compromise you feel on every draw. Order the version that matches the gun you actually have, and expect to spend a week adjusting cant and ride height before it disappears.
If you are still choosing, our concealed carry holster guide covers the wider field and the trade-offs between appendix, strong side and hybrid designs.
Best For: Every 43X owner, before anything else on this list.
10. Talon Grips Grip Tape
- Fits: Glock 43X and 48, the 43 uses a different wrap
- Texture: Rubber for comfort, granulate for grip
- Install: Clean, apply, hair dryer, done
- Street price: Around $20 to $25
| Capability gained | 4 / 5 |
| Ease of install | 5 / 5 |
| Value | 5 / 5 |
| Durability | 3 / 5 |
| Concealment cost | 4 / 5 |
Pros
- Twenty dollars for a real difference
- Reversible, comes off with heat
- The rubber version stays shirt friendly
Cons
- Granulate eats cover garments
- Peels at the edges eventually
- Not a substitute for stippling
The 43X frame texture is mild by design, because it is meant to sit against skin all day. That is the right call for carry and the wrong one for control, especially with wet hands or in the last few rounds of a long string.
Grip tape is the cheapest fix in firearms. Two pieces of pre-cut adhesive, ten minutes, and the gun stops moving in your hand. Talon sell it in rubber, which is kinder to shirts, and granulate, which grips harder and will sand the inside of a cover garment over a summer.
Get the rubber for a carry gun and the granulate for a range gun, and if you only own one 43X, get the rubber. It peels off with a hair dryer if you change your mind, which is more than you can say for stippling.
Best For: Every 43X. Buy it alongside the holster and the spare magazine.
What a Built Glock 43X Really Costs
A Glock 43X MOS sits at $484 in our price feed today. Buy everything on this page and you spend about $943 on top of it, so the parts cost roughly twice the pistol. That is worth seeing written down before the third order goes in.
The shape of that ladder is the useful part. The first $101, a holster and one spare factory magazine, buys most of the practical benefit. Grip tape and night sights take you to $243 and cover everything a carry gun genuinely needs. Everything past that is a light, a dot and a shooting-quality upgrade, and each of those is a bigger single cheque than the four parts before it combined.
That is not an argument against any of it. It is an argument for buying in the order above rather than the order the internet suggests, which tends to start with a red dot because a red dot photographs well.
How to Prioritize Your Glock 43X Build
Spend in the order that makes the gun carry better and shoot better under stress, and stop when it does what you need:
- A holster and a spare factory magazine. About $101, and it is the difference between owning a carry gun and carrying one.
- Grip tape. Twenty five dollars, ten minutes, felt on every draw.
- Night sights, suppressor height. Cheap insurance, and they leave the red dot option open.
- A light, if the gun has a home defence job as well as a carry job.
- A red dot, MOS slides only, and remember the adapter plate.
- A trigger, once you are shooting the gun enough to notice the difference.
- A match barrel last, or first if the whole point is a suppressor.
What I would not buy early: a magwell, which adds print to a gun chosen for concealment, and a replacement slide, which costs more than the pistol and solves a problem the MOS models already solved. And unless you are running S15 magazines, skip the steel catch entirely.
Still deciding on the gun itself? Compare it head to head in our Glock 43 vs 43X, Glock 48 vs 43X, Glock 43X vs SIG P365 XL and Springfield Hellcat vs Glock 43X breakdowns, or browse the wider field in our best subcompact 9mm pistols and best compact 9mm pistols roundups. New to Glocks? Start with our best Glock pistols guide, feed it quality 9mm ammo, and if you also run a full-size Glock, see our Glock 17 parts and accessories list.
Frequently Asked Questions
Does the Glock 43X come with 15-round magazines now?
Yes. GLOCK announced OEM 15-round SLIMLINE magazines at the 2026 NRA Annual Meetings, and the G43X and G48 now ship with them as standard. The magazine has a metal double stack body and holds fifteen rounds flush, so a new 43X is a 15+1 gun out of the box rather than a 10+1 one. Spares run about $30 to $35.
Do I still need the Shield Arms steel magazine catch?
Only if you run Shield Arms S15 magazines. GLOCK say the factory 15-round magazine includes a radius in the magazine catch recess that allows customers to maintain the standard magazine catch, so there is nothing to protect. Steel S15 bodies do wear the factory polymer catch over time, which is why the steel catch has been standard advice for S15 owners since 2019.
What is the best first upgrade for a Glock 43X?
A holster you will actually wear, then one spare magazine. That is roughly $101 together at current prices and it buys more real-world benefit than anything else on the list. Grip tape and night sights come next. A red dot is the upgrade people buy first and it should be near the end.
What red dot fits the Glock 43X MOS?
The 43X MOS slide is cut for the smaller K footprint, so the Holosun 507K X2 fits and the full-size 507C does not. GLOCK also note that the MOS models do not come with adapter plates, so budget for the correct plate as well as the optic. A standard non-MOS 43X has no optic cut at all.
Do Glock 43X parts also fit the Glock 48?
Frame parts do, slide parts mostly do not. GLOCK list the 43X and the 48 with the same 5.04 inch grip height and the same 1.10 inch width, so magazines, magwells, grip tape, magazine catches and rail-mounted lights cross over. The 48 slide is 6.85 inches against the 43X at 6.06 inches, and the 48 barrel is 4.17 inches against 3.41 inches, so barrels do not.
Will a Glock 17 or 19 light fit the Glock 43X?
No. The 43X uses what GLOCK call a slim mounting rail, which is narrower than the standard Glock rail on a 17 or 19. You want a light built for the slimline frame, such as the Streamlight TLR-7 Sub in its Glock 43X and 48 pattern. Note that the plain Glock 43 has no rail at all.
Can I put a red dot on a standard Glock 43X?
Not without milling the slide, which costs more than the optic and voids the factory finish over the cut. If a dot is part of the plan, buy the 43X MOS to begin with. It is about $36 more than the standard gun in our price feed and it saves you the machining bill.
How much does it cost to fully build a Glock 43X?
About $943 in parts on top of the pistol, using live retailer prices read on 9 September 2026. That is roughly twice what the gun costs. The first $101, a holster and a spare magazine, covers most of what a carry gun needs, and $243 covers everything genuinely necessary.
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