The Agency Arms Duty Magwell features a slightly larger footprint (vs. the EDC magwell) allowing a larger funnel for even faster reloads. It is also designed to work with both frames with the half-moon cut in the front and without. As with other Gen 5 magwells these are not universal magwells, they are back strap size specific. DISCLAIMER: This product is not manufactured, authorized, endorsed, or warranted by GLOCK. GLOCK does not warrant or represent that this product is compatible with GLOCK pistols.