a2 upper receiver
rock river arms, inc. offers a complete line of american made, custom built ar15 style rifles.
.223 / 5.56mm caliber .300 blackout caliber .450 bushmaster caliber .308 caliber 6.5 creedmoor caliber 7.62 x 39mm caliber accessories cleaning supplies & tools gunsmithing tools handguards & grips mcs (multi caliber system) publications sights & optics
m-16parts.com
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