General Information The specs on the gun I entered are for the stock gun. Since then I have made it a stubby m4 for CQB. I have done many upgrades internally as well, including a new bucking, tbb, and lots of things in the gearbox. Gallery new-stubby-m4-1.jpg 884.6 KB Views: 30 Share: Facebook Twitter Reddit Pinterest Tumblr WhatsApp Email Link