Best Glock 45 Parts & Accessories for 2026 (Crossover Upgrades)

The Glock 45 is the crossover: a G19-length slide on a full-size G17 frame, so you get a grip your whole hand fits on with a slide that’s easier to live with. It’s become one of the most carried and most issued Glocks for exactly that reason, and it inherits the biggest aftermarket in handguns.

Before any of that, something that changes what you should spend money on. The G45 is one of only three pistols in Glock’s Gen6 launch, and a Gen6 gun arrives with several of the things this page used to tell you to go and buy. That section comes first, because the cheapest upgrade is the one you already own.

Table of Contents

Glock 45 Upgrades at a Glance

Category	Our Pick	Fits	Why It Makes the List
Trigger	Overwatch Precision TAC	19X/45 Gen5, not Gen6	Flat face, cleaner break
Night sights	Night Fision	Glock 17/19/45	Tritium you can find in the dark
Co-witness sights	Suppressor-height set	Glock 17/19/45	Backup irons visible through a dot
Red dot	Holosun 507C X2	MOS or Gen6 slides	The biggest hit-probability gain
Weapon light	Streamlight TLR-7	Any railed G45	500 lumens on a slim body
Barrel	True Precision (G19)	G19-length slides	Accuracy, or a thread for a can
Slide	Zaffiri (G19)	Match your generation	Optics-ready without milling yours
Magazine	Glock 17-round	G17/34/45 Gen5	Full-size capacity, and you own three
Holster	Molded OWB Kydex	Glock 19/19X/45	Retention and a repeatable draw
Recoil spring	Factory dual assembly	Match your generation	Sixteen dollars, and it’s a wear part

Before You Buy Anything, Open the Box

Glock’s Gen6 launch covers exactly three pistols. We read their 2026 Buyer’s Guide to be sure, and the entries are unambiguous: G17 GEN6, G19 GEN6 and G45 GEN6, all 9×19. So unlike the Glock 21, which sat out this launch entirely, the G45 is right in the middle of it.

Here’s why that matters before you spend anything. Glock list what’s in a Gen6 set, and it’s more than you’d expect:

Each GLOCK Gen6 pistol set includes: GLOCK Safe Action pistol, including 3 magazines. Magazine speed loader. Cleaning set (rod with patch holder and brush). Instructions for use manual. Pistol case (for storage and transport). Backstrap set. 3 Optic plates.

gen6.glock.us

Read that again if you’ve got a Gen6 on the way. Three magazines, a backstrap set and three optic plates, in the box. On the last three parts guides we rebuilt, the plate was the thing the page told you to buy and then didn’t sell you. Here it’s the thing you already have, and buying more before you’ve opened the case is just money.

And the trigger is already flat

The guide’s Gen6 feature list includes a flat faced trigger as factory equipment, along with a thumb rest, deeper slide serrations, an enlarged beavertail, an undercut trigger guard and the RTF6 grip texture. Those are the things people have been buying aftermarket for a decade.

So the pick that used to sit at the top of this page, a flat-faced drop-in trigger, is now factory on a Gen6 G45. It’s still the right first purchase on a Gen5 gun. It’s just not a purchase you need to make twice, and we’d rather say so than sell you one.

The catch: Gen6 plates are not MOS plates

Glock describe the new arrangement plainly: standard frame Gen6 pistols “come optic-ready with three optic plates that allow various optics to be screwed directly into the slide”. That is a different system from MOS, which is what a Gen5 G45 MOS uses.

So there are two G45s walking around and they need different parts. A Gen6 has its plates in the box and a flat trigger fitted. A Gen5 MOS needs MOS plates bought separately and the trigger is still an upgrade. Work out which you have before you order anything on the optics side, because the plate aisle is about to fill up with parts for the other one.

What Gen6 doesn’t change

Worth saying, because a new generation makes people assume everything moved. Glock’s own 2026 guide lists the Gen6 gun as G45 GEN6 17/10 9×19. Same caliber, same seventeen rounds, same pistol underneath. The changes are ergonomic and they’re on the outside: texture, trigger face, serrations, beavertail, and how an optic attaches.

So most of this page still applies whichever you own. A light bolts to the same rail. A holster cut for a G45 still holds one, unless you’ve hung something new off the gun. Sights sit in the same G19-length slide. What changed is narrow, and it’s the narrow bit that costs money if you get it wrong, which is why it’s at the top rather than buried.

One honest limit on all of this. We’re reading Glock’s published material, not stripping two pistols side by side, so treat the parts that turn on internals, the recoil spring and anything in the fire control, as things to confirm against the listing for your exact generation. The box contents and the feature list are Glock’s own words. The rest is what the listings say, and we’ve told you where those go wrong.

Which Glock 45 Do You Have?

Two questions settle almost everything on this page, and you can answer both with the pistol in your hands.

1. Which generation

Look at the trigger face and the grip. A curved trigger and the older pebbled texture is a Gen5. A flat trigger face, a thumb rest and the coarser RTF6 texture is a Gen6, and if you bought it new recently that’s probably what you have.

Generation decides four things on this page: whether the trigger is already flat, whether the optic plates are in your case, which recoil spring assembly fits, and which slide you can buy. That last one is the expensive mistake, because aftermarket slides are sold separately for Gen3 and Gen5 and they run from about $267 to over $500. Nobody refunds a slide because you read the wrong word in the title.

2. Optics-ready or not

Look at the top of the slide behind the rear sight. A removable cover plate over a milled recess means you’re optics-ready. A solid slide means you’re not, and no plate fixes it: that needs a machine shop, or the aftermarket slide further down this page.

Then work out which mounting system you have, because there are now two and they are not compatible. A Gen5 G45 MOS uses Glock’s MOS adapter plates, bought separately, cut per optic footprint. A Gen6 uses the new arrangement with three plates supplied in the box. Same manufacturer, same model name, different parts.

The crossover rule, which is the good news

Here’s the part that makes the G45 cheap to build, and it’s worth memorizing because it answers most fitment questions on its own. Slide parts follow the Glock 19. Frame parts follow the Glock 17.

So barrels, slides and sights are G19 parts, because the G45 wears a G19-length slide. Magazines, grip sleeves and anything touching the frame are G17 parts, because the frame is full size. Holsters follow the outside shape, which is why they get listed for the “Glock 19/19X/23/45” together.

That rule is also why you’ll see listings naming seven or eight models at once. A sight set for the “Glock 17/19/19X/26/34/45” is not a vague listing, it’s an accurate one: those guns genuinely share a sight cut. Your gun named among several is fine. It’s only a problem when yours isn’t in the list at all, or when the number 45 in the title turns out to be a caliber.

The “45” Problem, and It’s Worse Than You Think

Every price block on this page runs against live retailer listings, and on this gun one thing breaks more cards than everything else combined. The number 45 means three different things, and the search box can’t tell them apart.

• Glock 45 is a model. Your 9mm crossover.
• .45 cal is a caliber, and on a Glock it means the large-frame G21 and G30. A different size of pistol entirely.
• FNX 45 is an FN Herstal pistol that has nothing to do with either.

All three landed in this page’s cards. The trigger listing’s cheapest row, at $31.97, was an “Overwatch Precision PolyDat Trigger for 45 Cal / 10mm Glock Pistols”, which is the large-frame part. Filtering “45 cal” was not enough either: an “Overwatch Precision GLOCK 45/10 Large Frame DAT V2 Trigger” walked straight through behind it. And the holster card opened with a $7.49 paddle rig for an “FN Herstal FNX 45, left hand”, which is wrong about the maker, the model and the hand at once.

The tell, as usual, is the price. A $31.97 trigger sitting under an $82 one isn’t a deal, it’s a different product. When you’re shopping this pistol, read the words either side of the 45 before you read the number.

Two more we filtered

A complete Glock 45 pistol at $499.99 was sitting in the magazine results, because its listing reads “Semi-Auto Pistol, 4.02 inch Barrel, (3)17 Round Magazines”. It matched a magazine search by describing the magazines that come with it. And a Springfield XDS trigger turned up in the trigger card, which isn’t a Glock part at all.

Worth saying what is not a problem, though. Listings naming the “Glock 17/19/19X/26/34/45” together are genuine shared parts, and that long list is the whole reason this gun is cheap to build: it takes G19 slide parts and G17 frame parts, so most of the 9mm Glock aftermarket applies to you.

Best Trigger: Overwatch Precision TAC

On a Gen5 G45 this is still the first thing we’d change. The factory trigger is safe and vague, and a flat-faced drop-in gives you consistent finger placement, a wall you can feel and a cleaner break, without touching the pistol’s safeties. It goes in inside an hour.

On a Gen6, skip it: yours is already flat from the factory. And whichever you have, check the listing names the 19X or the 45 and a generation. Kits marked Gen1-3 will not fit a Gen5 gun, and the “.45 cal” parts above will not fit anything you own.

Best Night Sights: Night Fision

Factory Glock sights are plastic, and on a gun you might need in the dark that’s the wrong place to save. Night Fision’s Perfect Dot sets are bright, tough and come in a front-dot-over-rear-U pattern that’s quicker to line up than chasing three dots.

These are listed for the Glock 17, 19 and 45 together, which is genuine: the G45 wears a G19-length slide and takes its sights. If a dot is in your future, take the suppressor-height set below instead, because standard irons vanish under an optic.

Best Co-Witness Sights: Suppressor Height

If there’s a dot on the slide, your irons need to be tall enough to show up in its window. That’s what suppressor-height sights are actually for, whatever the name suggests, and it’s the pick that turns a red dot from a single point of failure into something with a backup.

Trijicon and XS both make sets listed for the Glock 17, 19 and 45, and the XS DXT2 Big Dot names the 45 outright. Fit them when you fit the optic. Finding out your backup sights are invisible is a bad thing to learn in a low-light class, and a worse one to learn anywhere else.

Best Red Dot: Holosun 507C X2

The 507C X2 is the value benchmark and has been for years: shake-awake, a multi-reticle system, a solar backup and battery life measured in years. On a duty-size pistol there’s no reason to spend more unless you know exactly why you’re doing it.

Mounting is where you need to have read the section above. A Gen6 G45 has three plates in the box. A Gen5 MOS needs the MOS plate cut for this optic’s footprint. A non-optic slide needs milling or a new slide, which is further down this page. Sort that out before the dot arrives, not after.

One habit worth building whichever plate you end up with: put thread locker on the screws and torque them to the figure the optic maker gives, not to how tight your hand thinks is tight. A plate is one more joint between the dot and the slide, and joints are where zeros wander. Check the screws again after the first range session, then every few hundred rounds.

Best Weapon Light: Streamlight TLR-7

You can’t shoot at what you haven’t identified, so a defensive pistol needs a light. The G45’s full-size rail takes the TLR-7 without drama: 500 lumens, a short head that does not hang past the muzzle, switches on both sides.

Decide between the TLR-7 and the newer TLR-7X before you compare prices, because they share most of their name and the listings mix them. Then buy a holster molded for the gun and the light together, since a light-bearing pistol won’t go into a bare-gun shell.

Best Barrel: True Precision G19

The G45 wears a G19-length slide, so it takes G19 barrels, and that’s one of the reasons this gun is cheap to build. True Precision’s stainless barrels drop in without fitting and tighten groups noticeably, and the threaded versions open the door to a suppressor.

This is optional on a carry gun and worthwhile on one you shoot a lot. If you go threaded, remember the protector adds length your holster wasn’t cut for, and buy a spare protector because they disappear.

Best Slide: Zaffiri Precision G19

If your G45 is not optics-ready, a complete aftermarket slide is often cheaper than paying a shop to mill the one you own, and you keep the original intact. Zaffiri’s ZPS series comes optics-ready with lightening cuts and better serrations, and it drops onto your frame.

Match the generation. The listings separate Gen3 and Gen5 slides and they are not interchangeable, which is the single most expensive mistake available on this page: these run from about $267 stripped to over $500 complete. Read the generation in the title twice before you click.

Best Magazine: Glock 17-Round

The full-size frame takes G17 magazines, which is the other half of the crossover bargain: G19 handling with 17 rounds in the grip. Factory Glock magazines are the standard and ETS make a translucent version if you like counting rounds through the body.

Two notes. If your gun is a Gen6 you already have three, so buy spares rather than a first set. And watch what the listing is selling: these results carry 10-round versions, three-packs, ten-packs, and at one point a complete $499.99 pistol whose title mentioned the magazines it ships with.

Best Holster: Molded OWB Kydex

The G45 carries like a G19 and grips like a G17, which means most G19 holsters take it happily. A molded shell gives you retention you can trust and a draw that repeats, and CrossBreed, We The People and Concealment Express all make them at sensible money.

Listings naming the “Glock 19/19X/23/45” are genuine, since those share an outside shape. Match your configuration after that: light or no light, optic or not, threaded or not. And read the maker’s name, because an FNX 45 holster is not a Glock 45 holster no matter how the search results are sorted.

Inside or outside the waistband is the other call, and the G45 makes it genuinely arguable. The G19-length slide hides fine inside a waistband, but the full-size grip is the part that prints, so plenty of people who carry this gun end up outside the waistband under a cover garment instead. Buy for how you’ll actually dress, not for how you picture yourself dressing.

Best Sixteen Dollars: Factory Recoil Spring

The unglamorous one, and the first thing we’d buy for a G45 with real mileage. On a Glock the recoil spring and guide rod are one captured assembly, so this single part is both, and the factory dual-spring unit costs about the same as a box of ammunition.

It’s a consumable. A tired one throws brass further than it used to, makes the slide feel harsh, and eventually leaves the gun short of battery, which people blame on magazines for months. Match the generation, because the Gen5 assembly is not the Gen4 one, and if yours has thousands of rounds and has never been changed, start here rather than with anything expensive.

How to Prioritize Your Glock 45 Build

Work out which generation you have first, then:

1. Open the case. A Gen6 hands you three magazines, three optic plates, a backstrap set and a flat trigger already fitted.
2. A recoil spring if the gun has mileage. Sixteen dollars, and it fixes things the expensive parts can’t.
3. Sights. Night sights for irons, suppressor height if a dot is coming.
4. A light, then a holster cut for exactly what the gun has become.
5. The dot, with whatever mounting your generation needs.
6. A trigger on a Gen5, then a barrel or a slide if you’re chasing accuracy or an optic cut.

Want the background on the gun first? Read our Glock 45 review and the Glock 19 vs Glock 45 comparison, then see how it stands in our best Glock pistols and best full-size 9mm pistols roundups. Feed it with quality 9mm ammo.

Frequently Asked Questions