You've asked for it and we've made you wait long enough. We're finally offering individual upper receiver assemblies. Designed as a replacement upper for your standard Sugar Weasel or for whatever Frankenstein build you can think of. These uppers come in three variations a 7", 5/8x24 threaded, tapered 1:5 twist .300 Blk barrel, 13", 1/2-28 threaded, tapered 1:7 twist 5.56 barrel and 13", 5/8-24 threaded, tapered 1:6 twist .300 Blk barrel with our adjustable gas block in a pistol length gas system.