Upper guide · Short-barrel uppers
Made in the U.S.A.
The $200 federal tax on SBRs is gone. If you want to turn the AR-15 rifle you already own into an SBR, a complete short upper is the simplest way to do it. Here is every One Horse complete upper, and what to do before you install one.
Built for any standard mil-spec AR-15 lower receiver.
M16 Black Nitride BCG and a standard charging handle come installed. The BCG is also sold on its own as our 300 BLK bolt carrier group.
Made in the U.S.A. and backed by a limited lifetime warranty.
One Horse sells four short complete uppers: 7.5″ and 10.5″ in 5.56/.223, and 7.5″ and 10.5″ in .300 BLK. Each one comes with a BCG and charging handle and fits a mil-spec AR-15 lower. The $200 tax stamp is gone. And effective October 9, 2026, ATF says it will no longer enforce NFA approval and registration for short-barreled rifles and suppressors. This is an ATF enforcement policy, not a change in the law, and it could change. Check current ATF guidance and your state law before you build.
Key facts
Specs come from the spec tables on each One Horse product page.
The basics
A shoulder stock on a barrel under 16 inches makes a short-barreled rifle. The $200 tax stamp is gone.
And effective October 9, 2026, ATF says it will no longer enforce NFA approval and registration for suppressors, short-barreled rifles, short-barreled shotguns and AOWs, nationwide.
This is an ATF enforcement policy, not a change in the law, and it could change. State and local laws still apply. Check current ATF guidance and your state law before you build.
Compare
All eight complete uppers, short barrels first. Prices are live from the product pages.
| Upper | Barrel | Caliber | Twist | Gas | Handguard | Muzzle thread | Price |
|---|---|---|---|---|---|---|---|
| 7.5″ 5.56/.223 AR-15 Complete Upper | 7.5″ | 5.56/.223 | 1:7 | Pistol | 7″ M-LOK, free-float | 1/2×28 | $319.99 MSRP |
| 10.5″ 5.56 AR-15 Complete Upper | 10.5″ | 5.56/.223 | 1:7 | Pistol | 10″ M-LOK, free-float | 1/2×28 | $349.99 MSRP |
| 7.5″ .300 BLK AR-15 Complete Upper | 7.5″ | .300 BLK | 1:7 | Pistol | 7″ M-LOK, free-float | 5/8×24 | $319.99 MSRP |
| 10.5″ .300 BLK AR-15 Complete Upper | 10.5″ | .300 BLK | 1:7 | Pistol | 10″ M-LOK, free-float | 5/8×24 | $349.99 MSRP |
| 16″ 5.56/.223 AR-15 Complete Upper | 16″ | 5.56/.223 | 1:8 | Mid-length | 15″ M-LOK, free-float | 1/2×28 | $369.99 MSRP |
| 16″ 5.56 AR-15 HBAR Complete Upper | 16″ | 5.56/.223 | 1:8 | Mid-length | 15″ M-LOK, free-float | 1/2×28 | $369.99 MSRP |
| 16″ .300 BLK AR-15 Complete Upper | 16″ | .300 BLK | 1:7 | Pistol | 15″ M-LOK, free-float | 5/8×24 | $369.99 MSRP |
| 18″ 6mm ARC AR-15 Complete Upper | 18″ | 6mm ARC | 1:7.5 | Rifle | 15″ M-LOK | 5/8×24 | $519.99 MSRP |
Specs are from each product’s spec table. Shop all complete uppers.
Short-barrel uppers
Pick a caliber, then a length. The 7.5″ uppers use a 7″ handguard. The 10.5″ uppers use a 10″ handguard. All four have a 1:7 twist and a pistol-length gas system. See the buffer weight chart for a starting buffer, and every 10.5 AR upper side by side.
SKU: OH-CU03
SKU: OH-CU02
SKU: OH-CU06
SKU: OH-CU05
Choosing
Chambered for 5.56 NATO and .223. Uses your standard 5.56 magazines. 1/2×28 muzzle thread.
1:7 twist barrel with a 5/8×24 muzzle thread. Pairs with the Ryn .30 cal suppressor.
The 7.5″ is the shortest. The 10.5″ gives you a longer barrel and a 10″ handguard for more mounting room.
Add a suppressor
Match the suppressor to your upper’s caliber and muzzle thread.
The $200 tax stamp is gone. State and local laws still apply, and suppressors are not legal in every state. Order a suppressor online and we ship it to your dealer. When it arrives, you fill out a 4473 at your dealer. Once approved, you take it home. Dealer policies vary.
New to Plan B mounts? Read our Plan B mount guide.
Build it right
Free shipping on orders of $399 or more. Questions? Email customerservice@theonehorse.com.
FAQ
No. The $200 tax stamp is gone.
Effective October 9, 2026, ATF says it will no longer enforce NFA approval and registration for short-barreled rifles and suppressors. This is an ATF enforcement policy, not a change in the law, and it could change. State and local laws still apply. Check current ATF guidance and your state law first.
Yes. One Horse complete uppers are built for any standard mil-spec AR-15 lower receiver.
Yes. An M16 Black Nitride BCG and a standard charging handle come installed. You can pick an upgraded BCG on the product page.
No. A complete upper is not the serialized part, so it ships straight to you. Check your state and local law before you order.
The 5.56/.223 uppers have 1/2×28 muzzle threads, which match the Ashe 5.56/.223 (Plan B mount included). The .300 BLK uppers have 5/8×24 threads, which match the Ryn .30 cal (Plan B mount included).
One Horse complete uppers · Made in the U.S.A.
Every One Horse complete upper fits a mil-spec AR-15 lower and comes with a BCG and charging handle installed. Free shipping on orders of $399 or more.
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