AR-10mm Upper Assemblies – Premium Quality Uppers

AR-10mm Upper Assemblies | Premium Quality Uppers by Moriarti Armaments

AR-10mm upper assemblies chambered in 10mm Auto for pistol caliber carbines and AR pistols. Barrel lengths are 4", 7.5", 8.5", 10.5" and 16", in slick side or side charging versions with LRBHO or non-LRBHO, M-LOK handguards, cones, flash cans or A2 flash hiders.

Most uppers come complete with the bolt carrier group and charging handle, and some are offered in OD Green. Upper receivers are not serialized, so they ship directly to your address where legal.

FAQ

What does LRBHO mean?

Last round bolt hold open: the bolt locks back after the last shot. It needs a matching LRBHO lower and magazine. Non-LRBHO uppers are listed as such.

Do I need a special buffer?

Yes. 10mm blowback uppers need a heavy buffer, such as the 10 oz AR-45/AR-10mm buffer. See PCC stocks & buffers.

Can I put a barrel under 16" on a lower with a stock?

Only with an approved ATF Form 1 or Form 4 first: a stock plus a barrel under 16" makes a short-barreled rifle (SBR). On a pistol lower with a brace or bare buffer tube it can be built as a pistol where legal.