MBX 11 coil Hi-Cap Competition and Slide-Lock Follower kits are for the 140mm & 126mm MBX STI/SVI style tubes.
All components are designed to work with MBX tubes. Other manufacture parts may be used in conjunction with MBX parts, components, or tubes but may require adjustment/fitting for maximum reliability
*Slide-Lock kit may loss 1 to 2 rounds in the magazine.
NOTE: Not for use with MBX 10 Round Magazines