Well the Magpul fixed stock carbine length looks good Imo and is only like 30 bucks. That's will slide right over the rifle lenth tube? What I was worried about was the tube being to long and the stock wont seat right.In reality,,,if you buy a fixed stock it doesnt matter what length it is. It uses a rifle buffer and a rifle buffer tube,,,,,commercial or milspec is the only thing you need to determine when purchasing,,,,, when choosing stock and buffer tube,,,,buy milspec for both or commercial for both.