Mk4 - Available in: 5.56mm, 300 BLK, 5.7x28mm, 9mm, 22 ARC, 350 Legend, 6.5 Grendel, and 6mm ARC
Mk3 - .308 Win, 6.5 Creedmoor, 8.6 BLK
Mk17 - 9mm
Mk47 - 7.62x39mm
Mk57 - 5.7x28mm
MkG - .45 ACP
MkGs - 9mm
Br3 - .308 Win, 6.5 Creedmoor, 8.6 BLK
Br4 - 5.56mm, 300 BLK, 9mm, 22 ARC, 350 Legend, 6.5 Grendel, and 6mm ARC