I have a Bushmaster M4A3 and I was looking at getting a conversion kit for it, that will allow me to go hunting (legally) and for fun. Its either that, or the ever ubiquituous Beowolf .50 AE. The nice thing about the .458 SOCOM is that its not nessisary to modify the magazine. Also, if they (read: conservative gun control goups, namely VPC)decide to ban any cal. for a gun, it would be .50, not .458... Some Pictures of the .458 in action. Size comparison-.223 Vs. .458 SOCOM The full upper kit I have a carbine stock for my M4A3, if I were to purchase the .458 conversion, how hard would it be to install an A2 full stock to my gun?