M k.12 SPR
M k.12 SPR Caliber: 5.56 × 45mm M k.262 The U.S. Navy's Mk . 12 Special Purpose Rifle (SPR) has been used by special forces of the U.S. Army, Navy and Marine Corps in Operation Enduring Freedom and Operation Iraqi Freedom. SPR originally meant Special Purpose Receiver (Special Purpose Receiver). This replaceable upper receiver is part of the SOPMOD upgrade plan, but when an M4 carbine is replaced with this receiver, it becomes another type of receiver. A standalone weapon system, not just one of SOPMOD's accessories. Therefore SPR also stands for Special Purpose Rifle. The SPR has been designated the Mk . 12 by the Navy, and the SEALs began receiving the weapon in 2002, but Army Special Forces also use this designation. The SPR program is to provide the U.S. Army and Navy Special Forces (NAVSPECWAR) with a lightweight sniper rifle that has a longer effective range than the M4 carbine and is shorter than the standard M16A2/A4 . The weapons system was ori...