The BHI-15 MIL-SPEC Complete Upper Receiver is a drop-in replacement for your current AR-15 type system, or can be purchased in conjunction with Blackheart International's BHI-15 "Builder" custom ...

5/8″ receiver extension wrench. Precision Reflex AR-15 Upper Receiver Vise Block The Precision Reflex Upper Receiver Vise Block will be used for working on the upper receiver of your AR-15.

A semi-automatic tactical rifle chambered in 5.56 NATO, the Model 15 O.R.C. is Stag Arms’ least expensive AR-15 model at an average price point of $799 — less than the original Model 3.

Designed to replace an existing AR-15 upper assembly, DPMS’ blowback-operated, .22 Long Rifle-chambered flat-top uppers are offered in A3 and varmint configurations with 16-inch barrels ...

JP Enterprises introduced the solution for poor-fitting AR-15 and AR-10 upper and lower receivers. Loose receivers especially are the bane of most AR builds.

Test magazines included the Brownells mil-spec AR-15/M16 20-Round, C-Products Defense aluminum 20-Round, Magpul polymer PMAG20 20-round and Mission First Tactical polymer 10PM556 10-Round magazines.

By simply popping the takedown pins and switching the upper receiver assembly an AR owner can switch from a .22 long rifle or .410 shotgun used for hunting small game, on up to muscle cases like ...

To test it further, a metal AR-15 upper receiver was attached and a few shots fired with a higher-caliber .223. So far, the part seems to be holding up well and hasn't shown any major signs of wear.