This is a MasterPiece Arms known as the MPA57DMG chambered in 5.7X28MM, model MPA57DMG.
The new 57DMG uses a fully machined aluminum lower receiver and fully machined aluminum grips. The coating on this model is black cerakote. The new design provides complete compatibility with the FN57 magazines in both 20 and 30 round capacity.
Features:
Side Cocker
Scope Mount
20 Round Polymer Magazine
Accepts FN 20 or 30 Round Magazines
Muzzle Brake