Sylvan Arms GcB100 AR-15 to 9mm Glock Conversion Block


The Sylvan Arms 9mm Glock Conversion Block is a drop-in fit to give you a 9mm capable lower without resorting to buying a pistol caliber specific option. Designed to install in Mil-Spec lowers almost exactly like a standard rifle magazine.

3 in stock


– Easy to install and swap out

– Accepts popular Glock 9mm magazines

– Designed to work with Mil-Spec lowers

– Machined from black oxide steel and 6061-T6 aluminum

– Does not include last round bolt hold open

Designed, built and assembled in the USA

Additional information

Weight 7.5 oz
Dimensions 6 × 4 × 4 in