COMER, GA (December 2012) - MasterPiece Arms, manufacturers of the MPA MAC Line of semi-auto submachine pistols and carbines, is pleased to announce the new MPAR 556 Rifle, which will be unveiled at the 2013 SHOT Show in Las Vegas, Nevada and made available for purchase in the first quarter of 2013.This feature heavy design has been under development throughout 2012 and will feature some serious upgrades, including a short stroke piston design and a lightweight, free floating, two piece aluminum handguard with user located picatinny rails. It will also include an innovative front handguard cap to keep debris out of the internals of the handguards while providing strength and stability to the assembly. The MPAR 556 Rifle will also contain a side folder 6-position polymer buttstock, locked bolt action, and a side charging-handle with forward-assist. The MPAR 556 Rifle is compatible with AR15 / M16 magazines.