<P> The Barrett M82A1 rifle was used in 2002 as a platform for the experimental OSW (Objective Sniper Weapon) prototype . This weapon was fitted with a shorter barrel, and fired 25mm high - explosive shells developed for the 25 × 59 mm OCSW (Objective Crew Served Weapon) automatic grenade launcher . The experimental OSW showed an increased effectiveness against various targets, but the recoil was beyond human limitations . This weapon, also known as the Barrett "Payload Rifle", has now been designated the XM109 . </P> <P> The XM107 was originally intended to be a bolt - action sniper rifle, and the rifle Barrett M95 was originally selected by the U.S. Army in a competition between such weapons . However, under the trials, the decision was made that the U.S. Army did not, in fact, require such a weapon . </P> <P> Then the Army decided on the Barrett M82, a semi-automatic rifle . In summer 2002, the M82 finally emerged from its Army trial phase and was approved for "full materiel release", meaning it was officially adopted as the Long Range Sniper Rifle, Caliber . 50, M107 . The M107 uses a Leupold 4.5--14 × 50 Mark 4 scope . </P> <P> The Barrett M107 is a . 50 caliber, shoulder - fired, semi-automatic sniper rifle . Like its predecessors, the rifle is said to have manageable recoil for a weapon of its size owing to the barrel assembly that itself absorbs force, moving inward toward the receiver against large springs with every shot . Additionally, the weapon's weight and large muzzle brake also assist in recoil reduction . Various changes were made to the original M82A1 to create the M107, with new features such as a lengthened accessory rail, rear grip, and monopod socket . Barrett has recently been asked to develop a lightweight version of the M107 under the Anti-Materiel Sniper Rifle Congressional Program, and has already come up with a scheme to build important component parts such as the receiver frame and muzzle brake out of lighter - weight materials . </P>

What is the difference between the barrett m82 and m107
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