I couldn't really tell you on big. One of the toys is an m107 though so I do own few firearms. For semi Auto I love my Ar15, Ak, Sub2000 and my Fnx. For full Auto I have only been around a few. Have to say the M4's are not bad but still love shooting the P90 full auto. Your saying good bye to your wallet though in just under a few seconds but it's like shooting a .22 and just love it.