This recoil spring is color coded white indicating that it is optimal for use with 5.56 AR-15s with a carbine length gas system and buffer tube. Sprinco has extensively tested this setup and have concluded that it works great with 10” SBRs when used with an H2 buffer. It also helps you to easily identify which power spring you have in your AR-15 if you have a habit of changing your setup constantly.
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