Flat wire magazine springs support indefinite storage at full capacity without spring fatigue and are designed to prevent over-compression with anti-tilt followers.
These springs ensure a uniform feed rate and improved support for the top 4 rounds, while being easier to load compared to round wire springs.
Compatible with most magazine bodies and anti-tilt followers including USGI, Magpul, Lancer, and Hexmag, with exceptions like Brownells USGI Tan followers and some ETS and HK mags.