colt canada c20 dmr is a 7.62×51mm nato semi-automatic rifle, sniper rifle machine gun of the canadian armed forces and us army

51mm american ammunition armed arms army assault automatic c20 canada canadian carbine colt corps defense dmr firearm firearms forces gun long machine marine marines military nato navy range riffle rifle rifles riflescope scope seal semi semiautomatic shooting short silhouette sniper special swat system target ultra weapon