TTI Magazine Spring for STI, SV, & Rescomp Magazine Tubes

13 coil (170MM) magazine spring for the TTI competition follower. Designed exclusively by ISMI to work only with the TTI follower and made with ISMI quality and precision. Each coil compresses and stacks into the neighboring coil to provide the highest capacity available in your magazines.

Use the TTI Mag Spring with the TTI Base Pad and TTI Follower for maximum capacity.