PCC Techwell JP GMR-13 (for 9mm Glock mags) Lightning-Fast Mag Changes. 60 Second Slide-On, One Screw Installation. Requires no gunsmithing, or alterations to the receiver. 1/8” Hex Wrench included. Made from super slippery, super durable, Acetyl Delrin. Easy to file off the slight wear over time even for the daily dry-firer. Will easily accept even the short 10 round double stack Glock magazines. SPECS: Acetyl Delrin. Weight 2 7/8 Oz.