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One Horse Express

10.5" Express MLOK 5.56/.223 Atrius FRS Pistol

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Ships in 1-3 business days

SKU OHX-APS01UPC 850088856033

A reliable American-made black AR-style pistol featuring a modular handguard and ergonomic grip on a white background.

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  • Limited Lifetime warranty
  • Ships to your dealer
  • Free shipping

How buying a pistol works

  1. Order online.Pick any options above, then check out.
  2. Choose your dealer.At checkout choose a dealer that is close to you for transfer.
  3. Pick it up.Your dealer checks your ID, runs the required background check and hands it over. You must be at least 21 to buy this pistol.

Questions before you buy? Call 812-200-0305 or email customerservice@theonehorse.com.

What’s in the build

One Horse Express Specifications

  • Single Side Atrius SelectorTested, Tuned and Ready for the Range!
  • Breek Warhammer Mod2Ambi Charge Handle
Barrel
Caliber5.56mm NATO
Barrel Length10.5 in.
Barrel ProfileMedium
Muzzle Thread1/2×28
Twist Rate1:7
Gas SystemCarbine
Muzzle DeviceA2
Upper
Handguard Length9.25 in.
Charging HandleBreek Warhammer mod2
Lower
SelectorAtrius Single Side FRS
Buffer TubeMil-Spec
Furniture
GripTHRiL RTG - Rugged Tactical Grip
In the box
Magazine30 Round Magazine
Origin
ManufacturerOne Horse
Country of OriginU.S.A.
Test FiredEvery firearm is test fired before it ships
Videos

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Customer Reviews

Reviews

Real feedback from customers who have experience with this product.

5.0
★★★★★
6 reviews
Michael H. Oct 13, 2026
★★★★★

It worked as expected right out of the box. It is a pleasure to buy a product that does what they say it does. The build quality is excellent as expected. The only other request that I can make to One Horse is have either the rifle or pistol available with both the Atrius frt and suppressor.

Jared G. Oct 11, 2026
★★★★★

Everyone should own one!! Love this little AR express shoots smooth and built to last. Goes through ammo so be careful you will goes through you stock pretty fast. You will love any gun you get from one horse.

Dale O. Aug 27, 2026
★★★★★

Perfect size for what I wanted. Short, light and easy to move around with but still feels like a quality build. The FRS is alot of fun and everything ran good from the start.

Norman E. Jul 14, 2026
★★★★★

This little 10.5 is a blast. Nice and compact without feeling cheap or thrown together. The MLOK handguard feels good, Warhammer handle is a nice touch and the Atrius setup is crazy fun. Ran good right out the box.

Owen F. Jul 05, 2026
★★★★★

Finally got this thing out to the range and didnt want to put it down. Compact, loud and just plain fun to shoot. No problems with it so far and the Atrius selector is wild.

Jerry T. Jun 29, 2026
★★★★★

Ive owned a few AR pistols and this one surprised me. The handguard feels great and the controls are laid out nice. Fit and finish is better than I expected for the price. One Horse did good on this one.

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About

10.5" Express MLOK 5.56/.223 Atrius FRS Pistol

Some messages built this country. Some still do. The One Horse Express was born from that same spirit of independence—a rifle carried forward by the people who refuse to wait for permission. Developed in collaboration with Atrius Development Group, every Express rifle is assembled by Americans who believe the details are the difference between good enough and built right.

Engineered and built to a high standard, every rifle in the series leaves our floor with the Atrius Forced Reset Selector professionally fit, timed, tested, and factory installed—Built To Run™. It rides on a 16-inch CrMoV nitride SOCOM-profile barrel with a 1:8 twist, a mid-length gas system with a low-profile staked steel gas block, and an H2 buffer for smooth, dependable cycling. A curved trigger, 15-inch Express-Lock handguard, Breek Arms Warhammer Mod2, and Thril RTG grip and CCS stock round out a platform tuned as a complete system from day one.

This is more than a parts list. It's two American companies, one standard, pushing each other to build better and go further than either could alone. At Atrius Development Group, they say it best: Together we win. And that's exactly what we intend to do—win, with them. Their fight is our fight. The Express is proof of what that partnership delivers: a rifle engineered, assembled, and tuned to be carried forward. Independence isn't inherited. It's carried forward.

10.5" Express MLOK 5.56/.223 Atrius FRS Pistol questions

How do I get my pistol?

At checkout choose a dealer that is close to you for transfer. We ship to that dealer and you pick it up there.

How old do I need to be?

You must be at least 21 to buy this pistol.

Does it ship free?

Yes. Every Express rifle and pistol ships free.

When does it ship?

Ships in 1-3 business days.

Is there a warranty?

Yes. One Horse backs it with a Limited Lifetime warranty.

Ready when you are

Get your 10.5" Express MLOK 5.56/.223 Atrius FRS Pistol

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FREE SHIPPINGLimited Lifetime warranty

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MSRP: Original price was: $1,349.99.Current price is: $1,249.00.

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