The Mauser M2 was actually manufactured by SIGArms between 2000 and 2004. Early production guns were made in Germany, while later examples were assembled in SIG's Exeter, New Hampshire facility from imported parts.
Mauser Federal Model M713 Semi-Auto Carbine. The carbine version of the "broomhandle" Mauser C96. Wacky, but not really player wacky, unless as a bizarre workaround to a pistol-based build or pistols-only mission restriction.