This Bear Creek Arsenal complete upper (Bear Creek Arsenal part no. UAF1016556MM4161) is chambered in 5.56 NATO on a 10-inch barrel with carbine-length gas, an M-LOK handguard, and a 1:7 twist built for a compact pistol-configured AR build.

Key Specifications

• Brand: Bear Creek Arsenal.
• Caliber: 5.56 NATO.
• Barrel length: 10 inches.
• Rate of twist: 1:7.
• Gas system: carbine length.
• Handguard: M-LOK.

Frequently Asked Questions

Can I put a shoulder stock on this upper? Not without prior ATF approval. Putting it on a shouldered rifle lower makes a short-barreled rifle; since October 9, 2026, ATF no longer requires Form 1 approval or registration for that, but state law still applies, and taking an SBR across state lines needs an approved ATF Form 5320.20.

What gas system length does this upper use? Carbine length, matched to the 10-inch barrel.

Buy the Bear Creek Arsenal Complete Upper, 5.56 NATO, 10in, Carbine Length, M-LOK

Get the Bear Creek Arsenal Complete Upper, 5.56 NATO, 10in, Carbine Length, M-LOK from Bear Creek Arsenal, browsable in our full AR15 Uppers selection. Order from a Lubbock, TX gun shop for insured shipping.