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Caliber:5.56x45mm MK.262

U.S. Navy Mk.12 Mod 0 / 1 Special Purpose Rifle (Special Purpose Rifle, referred to as SPR) has been the U.S. Army, Navy and Marine Corps special forces in Operation Enduring Freedom and Operation Iraqi Freedom used. SPR initially said that it meant Special Purpose Receiver (Special Purpose Receiver), this can change the composition of the upper casing SOPMOD upgrades are part of the plan, but an M4 carbine to replace the casing Shiyou be another such separate kinds of weapons systems, not just one of the SOPMOD accessories. Therefore, SPR also said that special purpose rifle.
SPR has been designated as the Navy Mk.12, seals in 2002, started to accept this weapon, but the Army Special Forces also use this name.

SPR program is for the U.S. Army and Navy special forces (NAVSPECWAR) to provide an effective range than the M4 style carbine far shorter length than the standard M16A2/A4 light sniper rifle. This weapon system was originally from Ma Kewei Estero (Mark Westrom) plan, when he was working at the Rock Island Arsenal, and now chairman at ArmaLite. But SPR seem to have with the planned SOPMOD Block 4 and the Navy Seals "reconnaissance rifle" together has been canceled. Reason is that special forces for such "light sniper rifle" does not seem cold. Firearms in a foreign forum,
There have been a SEAL team Huitie that SPR is "dog feces," refers to its "power is weak, with a range too close, not suitable for sniping mission." In fact SPR with the Army's SDM-R and the Marine Corps SAM-R the same, perhaps the emphasis on special forces raid Kuaijinkuaichu do not love war, is responsible for monitoring or flank guard sort of combat personnel would rather he chose to take aim Mirror assault rifles; while if it is necessary to use semi-automatic sniper rifles the task, they have a lightweight, long range and accurate Mk11 Mod 0, so such as the SPR is not high not low "intermediate" sniper rifle is simply useless field. (The above analysis is purely personal speculation)

Although the SPR rifle prospects dim, but recently it is still found in Iraq appear in photographs. In civil, SPR rifles, imitation (with the whole gun has converted parts, commonly known as "SPR clones") has also been a number of targets in the United States between the gun shooters and collectors popular, so popular AR-15 itself is the target Gun Shooting welcome high-precision rifles, into SPR, the only further improve the accuracy, shape and cool.