5 Inch AR Pistol Kit — Compact, Reliable, Ready to Build

5 Inch AR Pistol Kit — Compact, Reliable, Ready to Build

Posted by Ar15-Overstock on Sep 08, 2025

5 Inch AR Pistol Kit: Compact Size, Real-World Performance

If you want a compact AR pistol that balances maneuverability, reliability, and ballistics, the 5 Inch AR Pistol Kit is the ideal choice. At AR15-Overstock, our 5" kits are selected to deliver a tuned gas system, quality components, and accessory-ready handguards — everything you need to build a dependable pistol without paying retail prices.

Why choose a 5 Inch AR Pistol Kit?

  • Perfect compromise: Shorter and more maneuverable than 7.5" uppers, but with noticeably better velocity and reliability than 4.75" barrels.

  • Tuned gas system: Many 5" kits include a micro gas system and matched gas block for smoother cycling.

  • Accessory-ready: Free-float M-LOK handguards and threaded muzzles let you add lights, brakes, and sights.

  • Complete builds or uppers-first: Shop full kits for turn-key convenience or pick a dedicated 5" upper to customize your parts list.

What’s included in our 5" kits

Typical 5 Inch AR Pistol Kits from AR15-Overstock contain:

  • 5" barrel (5.56 NATO, .300 BLK, or 9mm options)

  • Flat-top upper receiver for optics

  • Free-float M-LOK handguard

  • Micro gas system and low-profile gas block

  • Bolt Carrier Group (BCG) & charging handle (in most kits)

  • Threaded muzzle device or protector

Prefer to start with the upper only? Shop dedicated 5" uppers → 5" Uppers

Who benefits most from a 5" AR pistol?

  • Home defense users who want quick handling and easy storage.

  • Builders who want a compact truck gun or range pistol with usable ballistics.

  • Enthusiasts who prefer an uppers-first approach and want precise control over components.

Uppers-first shopping flow 

  1. Pick the exact 5" upper you want. Browse: All Uppers • 5" Uppers

  2. Confirm whether the upper includes BCG & charging handle.

  3. Add the correct lower, buffer/brace, and magazines for your chosen caliber.

  4. Finish with optics and accessories that mount to the free-float handguard.

Want a full kit instead of sourcing parts? See 5" pistol kits → 5" AR Pistol Kits

Quick buying checklist

  • Barrel length & caliber match your needs (5.56, .300 BLK, 9mm).

  • Gas system length is correct for a 5" barrel (micro gas / carbine tune).

  • Upper includes or specify BCG + charging handle.

  • Handguard type (M-LOK free-float) for accessory options.

  • Confirm local & federal compliance for AR pistol builds.

FAQ 

Q: Is a 5" AR pistol legal?
A: Legality depends on federal and state laws—check local regulations and ensure your configuration complies.

Q: Will a 5" barrel run reliably?
A: Yes — when paired with a properly tuned gas system, quality BCG, and correct buffer setup, 5" uppers run very reliably.

Q: Which calibers are common for 5" kits?
A: 5.56 NATO, .300 Blackout, and 9mm PCC are the most popular choices for 5" builds.

Q: Do 5" kits include the BCG?
A: Many kits do — check the product listing. If not, add a compatible BCG & charging handle.

Q: Should I buy an upper first or a full kit?
A: If you want full control of components, buy the upper first. For convenience and savings, choose a complete 5" pistol kit.

Ready to build? Shop our curated selection of 5 Inch AR Pistol Kits and dedicated 5" uppers now: Shop Kits

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