FOLLOWING INFORMATIONS FROM: http://www.wapahani.com/addenamr.htmlFollowing on the heels of the M2A rifle, the M3 model is designed as a more compact, bullpup rifle. It is designed for easier carrying and deployment by troops in the field, again it is a single shot rifle capable of engaging targets at long ranges. It's lighter weight made it somewhat popular with it's use by sharpshooters in the field who often would find themselves walking distances from troop convoys". The MACS M3 fires the 12'7x99mm cartridge. PLEASE NOTE: according to various websites, this may be an unlicensed copy of the Hungarian LANDIMEX LIMITED-TECHNIKA "DESTROYER" heavy sniper rifle.
Picture and information courtesy of: PIERANGELO TENDAS