For the small price difference, going Colt is worth the peace of mind. DPMS states that they will void your warranty if you use non-domestic ammo. I don't know about you guys, but I find PMC, Wolf Gold & Israeli bulk ammo, all of which DPMS don't want you to use, to be better quality than almost all domestic bulk ammo. They might have this warning to keep you from using any steel cased ammo, but I find it silly.