SLR Rifleworks Magazine Extension +4 for GLOCK 21

A few extra rounds can be the difference between a costly reload on the clock and crushing a stage. The SLR Rifleworks +4 magazine extension installs quickly and easily to your favorite Glock factory or ETS magazine for the Glock 21 handgun, bringing your capacity to an impressive 21-rounds per magazine. Machined from high strength 6061-T6 aluminum, these extensions also add additional mass to ensure your magazines reliably drop free during reloads.

Features:

• For factory and ETS Glock 21 Magazines
• Adds +4 capacity
• Machined from 6061-T6 aluminum
• Hardcoat anodized matte black
• Increased mass for reliable drops
• Requires extra power spring (sold separately)

SLR Rifleworks is a firearms manufacturer based in central Florida that specializes in bringing new, innovative parts to the AR-15 platform. SLR has even expanded into the AK-47 and Glock platforms with various components like stocks, muzzle devices, and magazine wells.