Sylvan Arms GCB100 Conversion Block Converts AR-15 Lower To 9mm Lower Using Glock Magazines, Compatible with Glock 17 & 19 Magazines

The Sylvan Arms 9mm Glock Conversion Block converts your AR-15 lower to a 9mm Lower using Glock magazines. The Glock Conversion Block is built to handle any standard mil spec lowers with most 9mm uppers. Works with Glock 17 and Glock 19 magazines. Designed, built and assembled in the USA.