From custom gas blowback pistols and now back to custom rifles again, Airsoft Surgeon just turned another airsoft rifle into a nice looking SPR and available at RedWolf Airsoft... "The SPR, used by Special Operations Forces of both the U.S. Army and U.S. Navy, is a heavily modified light designated marksman variation of the M16 line of infantry weapons, and is chambered for NATO standard 5.56x45mm ammunition.