10-19-2017, 04:59 AM
I've got a buddy that wants me to find or build him a left handed Grendel upper with a 20" barrel, also looking to build/find one for my dad. I've built right handed uppers and have no problems there, but never built a lefty upper. Obviously I need the left handed receiver itself, but aside from that, are there any differences? Will the barrel need a different extension? Does the bolt or whole BCG need to be different? Also, does anybody know where I can get a left handed upper to start with? Or a complete lefty upper? Any help would be greatly appreciated!