Guncrafter Industries 50 GI Glock magazines 9 Round.The magazines for our Glock conversions were designed especially for the 50 GI from the ground up. Beginning with a redesigned hardened steel liner, add a polymer over-mold, a corrosion resistant stainless steel extra-power spring, and finish it up with a proven follower and you have the very best polymer magazine for the job. They feature our patented crimped feed lip design that in conjunction with the rebated rim of the 50 GI cartridge prevents nose diving and ensure almost in-line feeding. This “controlled round” feature guarantees reliability.