Various (assembled by NSWC Crane)

The Mk 12 Mod 1 is a designated marksman rifle used by US special operations forces. It was developed as the Special Purpose Rifle (SPR) program to provide a precision semi-automatic capability in 5.56x45mm NATO. The Mk 12 Mod 1 features a free-floated match barrel and a PRI handguard system. It is built on an AR-15 style lower receiver with a match trigger. The rifle is designed to extend the effective range of the M4 carbine for designated marksmen in squad-level units.