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

The Glock 45 is the “crossover” Glock — a compact G19-length slide on a full-size G17-length frame, giving you a shootable full grip with a slightly handier slide. It has become one of the most popular duty and everyday-carry Glocks for exactly that reason, and it takes the same enormous aftermarket as the rest of the 9mm Glock family. A few well-chosen parts turn a stock G45 into a dialed-in carry or duty gun.

Below are the Glock 45 parts and accessories we would buy first. Because the G45 shares its slide and barrel length with the Glock 19 and its frame and magazines with the Glock 17, most G19 and G17 parts fit — which we have noted where it matters. Each pick is backed by a live price check across the retailers we track.

Glock 45 Upgrades at a Glance

Category	Our Pick	Why It Makes the List
Trigger	Overwatch Precision	Flatter face, cleaner break
Night sights	Night Fision	Bright tritium, co-witness ready
Red dot optic	Holosun 507C	The value benchmark dot for the MOS slide
Weapon light	Streamlight TLR-7	Slim 500-lumen light for the full-size rail
Barrel	True Precision (G19)	Match accuracy, threaded options for a can
Aftermarket slide	Zaffiri (G19)	Optics-ready, lightened, machined for a build
Magazine	17-round (G17)	Full-size capacity in the full-size grip
Holster	Molded Kydex	Carry or duty retention with a clean draw

Best Trigger: Overwatch Precision

If you only change one thing, make it the trigger. The factory Glock trigger is safe but spongy, and a flat-faced drop-in from Overwatch Precision gives you a more consistent finger placement, a cleaner wall, and a crisper break without touching the gun’s safeties. It installs in minutes and is one of the changes you feel on the very first magazine.

Best Night Sights: Night Fision

Factory Glock sights are plastic, and the front sight is held on by a single screw that likes to walk loose. Swapping to a Night Fision tritium set is one of the cheapest upgrades that pays off every time the light gets low. They are bright, glow all night, and are offered in suppressor and optic co-witness heights, so they still work if you add a red dot.

Best Red Dot Optic: Holosun 507C

The Glock 45 MOS was made for a red dot, and adding one is the biggest hit-probability upgrade you can make. The Holosun 507C is the value benchmark: a rugged open reflex with shake-awake, a multi-reticle system, a solar backup, and years of battery life, mounted on the correct MOS plate. Co-witness it with suppressor-height irons for a backup.

For more optic options, see our best red dots for concealed carry guide.

Best Weapon Light: Streamlight TLR-7

A duty or home-defense G45 needs a light. The full-size frame runs a proper rail, and the Streamlight TLR-7 is the slim-body standard at 500 lumens, with a compact head that clears most holsters and ambidextrous switching. Buy a holster molded for a light-bearing G45 once you mount it.

Best Barrel: True Precision (G19 Length)

The Glock 45 uses a Glock 19-length barrel, so G19 match barrels drop right in. A True Precision barrel tightens groups, adds a supported chamber, and — in threaded form — lets you run a compensator or suppressor. It is a shooter favorite for the money, with proper button rifling and finishes to match a custom build. Match the thread pitch to your can if you go threaded.

Best Aftermarket Slide: Zaffiri (G19 Length)

Because the G45 wears a Glock 19-length slide, G19 optics-ready aftermarket slides fit it. A Zaffiri Precision slide comes machined for a red dot with aggressive serrations and lightening cuts that reduce reciprocating mass for a flatter-shooting gun. Drop it on your factory frame with a barrel and a completion kit and you have a modern optics-ready pistol for a fraction of a full custom.

Best Magazine: 17-Round (G17)

The Glock 45’s full-size grip takes Glock 17 magazines, so you get 17 rounds flush — one of the gun’s best features. Factory Glock mags are the gold standard, and the translucent ETS mags are a solid range option that let you see your round count. Buy several; you can never have too many, and 33-round stick mags work too.

Best Holster: Molded Kydex

Whatever role your G45 plays, the right holster makes it work. A molded Kydex holster made for the Glock 45 (or a Glock 19/17-compatible cut) gives you secure retention and a clean, consistent draw, in IWB for concealment or OWB for duty and range. Match it to your exact configuration — bare gun, light-bearing, or optics-cut — and skip the universal holsters.

How to Prioritize Your Glock 45 Build

The G45 is a duty and carry Glock, so spend money in the order that makes it shoot and carry better:

1. Sights and a trigger first. Together they cost little and change how the gun shoots more than anything else.
2. A red dot if your slide is MOS-cut — the biggest hit-probability upgrade at speed.
3. A light for any gun with a defensive role.
4. A barrel, an optics-ready slide, magazines, and a holster to finish an accuracy or carry build.

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

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