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U300 uppers are machined from billet 7075 aluminum, come with DRD QD 13" rail assembly and FN hammer..
This 5.56 NATO build kit includes a Mil-Spec 7075 billet flat top upper receiver, a 13" Tactical QD ..
This 7.62 NATO build kit includes a DPMS pattern billet upper receiver, a 13" Tactical QD rail assem..
Franklin Armory's F17 V4 Complete Upper Assembly features a Free Float Handguard (fluted and vented,..
The kit includes a complete upper, an F17 series magazine, and an F17 carbine buffer. The F17-M4 up..
Franklin Armory's F17 SPR upper is constructed of forged 7075-T6 aluminum with a hard coat type III ..
The 410 ARU upper allows any AR15 to be converted to a 410 shotgun. It features an 410 gauge 18.5" b..
The UAR is a precision machined upper with a special burnished bore that gives a compacted internal ..
The USC is a precision machined upper with a special burnished bore that gives a compacted internal ..
This MK1 Mod2 Upper from Primary Weapons features a 11.85" barrel, a carbine gas piston system, and ..
The MK118 upper is a gas piston system at a mid- length. It features a 18 inch barrel, and has key m..
The Bootleg upper receiver is machined from 7075 aluminum and mil spec hard anodized. It features a ..
The shortest of the non-NFA models with a removable muzzle device, the MK116 Upper is a crowd favori..
The shortest of the non-NFA models with a removable muzzle device, the Primary Weapons MK216 Rifle i..
For those customers requiring a longer barrel, Primary Weapons offers the MK220, a 20" barreled .308..