*Designed to work with TTI Follower.
- TTI Magazine Spring for STI, SV, & Rescomp Magazine Tubes 11 coil (140MM) 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.
