Sylvan Arms AR-15 9MM Glock Magwell Adapter
The Sylvan Arms 9mm Glock Conversion Block converts your AR-15 lower to a 9mm Lower compatible with Glock magazines. This Glock Conversion Block is built to handle any standard mil-spec and non Mil-Spec lowers and any 9mm upper.
Works with Glock 17 and Glock 19 magazines.
Built of 6061 aircraft grade aluminum.