This is a ZEV Technologies Magwell known as the PRO, model MW.K-STD-PRO-AL-B.
ZEV created the market for high end GLOCK upgrade parts and continues to offer the most extensive catalogue. From their renown triggers" slides and barrels to the smallest of springs" if you are a serious shooter ZEV has your upgrade. All ZEV Products are proudly made in the USA.
Features:
Smooth Anodized Finish
One-Piece Design
Flared Base for Easier Reloads