STI/SV/SPS 170mm Magazine 13 Coil Spring & Follower Kit by Grams Engineering
This ''Follower Kit'' includes a ''Grams Format'' follower (S2) and 13 coil spring. For use in STI/SV/SPS or CR mags that measure up to 145mm long (with base pad attached).
- 9mm, .38 Super, 38 Super Comp / TJ, .40 S&W and .45 ACP calibers (no spacer in magazine)
- 9mm (requires a spacer in magazine, older STI magazine tubes)
Just buy it. Works.