This is the only AR15 spring engineered specifically to handle the increased demands of high performance applications for the professional or sporting user.

Please note that this spring is not intended for use with "light" ammunition. It is built to perform optimally using 5.56mm NATO ("ball") military specification rounds.

A few features of our CS spring --

Enhanced rifle performance
This spring ensures reliable, correct function over the life of your AR15-type rifle. Due to the superior nature of its material, SpeedLock CS springs have the same power as a conventionally constructed "extra power" spring, yet provide that extra energy using a lighter spring weight! Correct timing and resistance on the recoil stroke and a controlled rebound ensures reliable feeding with consistent forward thrust. The result is that the rifle functions flawlessly and stays on target better. You can feel, and see, the difference! With our CS Spring, the bolt will remain locked a little longer, allowing pressures more time to subside. This means getting those heavy bullets to needed velocities can be more safely and reliably accomplished.

Unaffected by temperature
Music wire and carbon steel springs are adversely affected by temperatures as low as only 175° F. SpeedLock CS springs perform flawlessly in excess of 700°. The result is perfect consistency and reliable performance under any extreme. This can be big factor in a AR15-type rifle -- they get hot! Performance will not change in rapid fire or full-auto conditions, and neither will function or accuracy.

Extended life at optimum performance
A conventional buffer spring is constructed of music wire. It will last approximately 5000 rounds before its performance has degraded to the point that rifle function will change. Well, this is the last spring you will ever need for your AR15! SpeedLock CS springs are duty rated for 500,000 compression cycles at maximum performance. A standard spring loses as much as 25 percent of its capacity in less than one year -- whether the rifle is used or not!

Perfect consistency
Rigid 9002 Quality Control Standards, certified materials use, and our exclusive post-winding processing guarantees true, consistent performance. Although this is the last spring you'll ever need to buy, it may not be the only one you ever purchase! Conventional AR15 buffer springs are notorious for exhibiting wide variances. Unless you're using a SpeedLock CS spring, not only are you replacing springs continually, but rifle performance may be continually changing with each replacement.