6.5 Grendel for ModulAR2

6.5 Grendel now comes to ModulAR2 and AR2+.

Included in the mod is the original side-charging receiver, slightly modified to fit for ModulAR2.

Also important is the ability to chamber in the 6.5 Grendel rounds in any ModulAR2 platform, with 4 different capacity PMags, all textured to fit in only 6.5 Grendel rounds.