FAXON PRO 12.5" 5.56 NATO AR15 PISTOL

AR15 Firearms › PRO › PRO 12.5″ 5.56 Pistol

What’s on This Pistol

The parts that decide how an AR-15 shoots are Faxon parts, and each one is sold on its own: every card links to its product page, specs, and reviews.

Controls, Furniture, and What’s in the Box

What PRO Means

The PRO line builds on the SPORT foundation with configurations inspired by law enforcement and experienced shooters. Each one is set up around its cartridge, then upgraded with the parts experienced owners end up buying anyway: the Faxon Enhanced Match Trigger by Schmid®, an ambidextrous safety, the Faxon Edition BREEK® Sledgehammer gas-blocking charging handle, B5 Systems® furniture or an SB Tactical® brace, and an optimized Faxon muzzle device. See every PRO firearm or compare all four lines.

Why 5.56 in a 12.5″ pistol

5.56 NATO is the AR-15’s native cartridge: it fires 5.56 NATO and .223 Remington, magazines and ammunition are everywhere, and the 1:8 twist stabilizes everything from 55 gr FMJ to 77 gr match bullets. A mid-length gas system on a 12.5″ barrel keeps the impulse soft and the parts wear low.

Running a Suppressor

The muzzle is threaded 1/2x28, so a direct-thread HUB adapter or any 5.56 muzzle-device mount works.

How It’s Built and Inspected

What Makes a Good AR-15 Pistol, and How This One Stacks Up

Reviewers who rank AR-15s weigh the same things: reliability, accuracy, build quality, and value, which come down to the barrel, the gas system, the bolt carrier group, the trigger, and the receivers. Here’s this one, part by part.

What Reviewers and Owners Say

This configuration is new, so it has few reviews of its own yet. Every major part on it is sold on its own, so here’s what independent reviewers and Faxon customers have said about the barrel, receivers, carrier, handguard, and gas block.

Average ratings on FaxonFirearms.com, out of 5 stars: 12.5″ Gunner 5.56 barrel: 5.0; BCG: 4.9; gas block: 5.0; upper receiver: 4.9.

Compare the PRO Line

PRO 12.5″ 5.56 FAQs

Is the Faxon PRO 12.5″ 5.56 NATO AR15 Pistol a good AR-15 pistol?

It’s built around the parts that matter most: a Faxon Duty Series 4150 CMV barrel that’s borescoped, air gauged, headspace gauged, and 100% MPI inspected; Faxon forged receivers; the Superfinished 5.56 M16 BCG; a Schmid® match trigger; and a free-float M-LOK handguard. It’s assembled in Ohio by the company that makes the barrel, and it’s covered by the Faxon Lifetime Guarantee.

What comes in the box?

The complete pistol, Magpul® PMAG® 30 Gen M2 MOE (5.56/.223) magazine, 5.56 magazine marker bands, cable lock, chamber flag, owner’s manual. Optics, sling, and suppressor are not included.

What ammunition and magazines does it use?

5.56 NATO and .223 Remington. Magazines: Standard AR-15 / STANAG 5.56 magazines. Bolt: standard 5.56 / M16-pattern bolt (installed).

Can I put a suppressor on it?

Yes. The muzzle is threaded 1/2x28, so a direct-thread mount or a muzzle-device mount works. Tune the adjustable gas block for the can.

Is this a pistol or a rifle?

It’s sold as a pistol: a 12.5″ barrel with an SB Tactical® SBA3 pistol brace, not a stock. Laws on AR pistols and pistol braces vary by state and locality and can change, so know and follow the laws where you live. Faxon doesn’t provide legal advice.

Do I need to adjust the gas block?

Not to start shooting. If you add a suppressor or change to very different ammunition, tune it: with the firearm unloaded and the block cool, start fully open, close one click at a time until the bolt stops locking back on an empty magazine, then open one or two clicks. A 3/32″ hex key or flat screwdriver does it.

What does PRO add over SPORT?

Each one is set up around its cartridge, then upgraded with the parts experienced owners end up buying anyway: the Faxon Enhanced Match Trigger by Schmid®, an ambidextrous safety, the Faxon Edition BREEK® Sledgehammer gas-blocking charging handle, B5 Systems® furniture or an SB Tactical® brace, and an optimized Faxon muzzle device.

Nitride or chrome lining: which is better?

Chrome lining still has its place, mainly sustained automatic fire. For the vast majority of shooters, Faxon’s salt-bath QPQ nitride does what they need and more: it hardens the bore and exterior, resists corrosion, adds virtually nothing to the dimensions (a few ten-thousandths of an inch, about a tenth the width of a human hair), and needs little to no break-in.

How does it ship?

To a licensed dealer (FFL). Enter your dealer’s information at checkout. Federal, state, and local laws apply.

Where is it made, and what is the warranty?

Faxon makes the barrel, receivers, gas block, and muzzle device in Greater Cincinnati, Ohio, and assembles the pistol there. It’s covered by the Faxon Lifetime Guarantee.

MuzzLok®, HARMONIX®, CORESYNC®, and Integral® are trademarks of Faxon Firearms. BREEK®, Schmid®, B5 Systems®, SB Tactical®, Magpul®, PMAG®, Lancer®, Mission First Tactical®, Cerakote®, and Glock® are trademarks of their owners; Faxon is not affiliated with them. “Plan B” is a trademark of Q, LLC; Faxon Firearms is not affiliated with, endorsed by, or sponsored by Q, LLC. Firearm, pistol brace, suppressor, and barrel-length laws vary by state and locality; know and follow the laws where you live.