MBX Z-Max Springs for STI/SVI & all 2011 Style Pistols

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.
MBX Z-Max 11 Coil Spring
Single Springs
5 Pack Springs
MBX Z-Max 11 Coil Spring for use with MBX 140mm & 126mm magazines for STI/SVI & all 2011 Style Pistols

Custom wound Wolff spring produces maximum reliability and feed when used in conjunction with MBX products.


MBX Z-Max 11 Coil Spring & Competition Follower Set
MBX Z-Max 13 Coil Spring
Single Springs
5 Pack Springs
MBX Z-Max 13 Coil Spring for use with MBX 170mm & 155mm magazines for STI/SVI & all 2011 Style Pistols

Custom wound Wolff spring produces maximum reliability and feed when used in conjunction with MBX products.


MBX Z-Max 13 Coil Spring & Competition Follower Set
MBX Z-Max Slide-Lock Spring
Single Springs
5 Pack Springs
MBX Z-Max High-Capacity Slide-Lock Spring for use with MBX 140mm & 126mm magazines for STI/SVI & all 2011 Style Pistols

~ Loss of 1 to 2 rounds

Custom wound Wolff spring produces maximum reliability and feed when used in conjunction with MBX products.


Not for use with MBX 10 Round Magazines

MBX Z-Max Slide-Lock Spring & Slide-Lock Follower Set