Sprinco M4 /AR-15 Carbine Red Extra Power Carbine Buffer Spring
- For carbine length buffer tubes
- Color coded red
- Extra power
- Made from chrome silicon wire stock
- Heat treated and shot peened
This recoil spring is color coded red indicating that it is optimal for use with 5.56 AR-15s with a carbine length gas system and buffer tube with a 16” barrel. Sprinco has extensively tested this setup and have concluded that it also works great with thumper cartridges like .458 SOCOM, 6.5 Grendel, .450 Bushmaster, and more. 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.
Ratings & Reviews
A must have for thumper cartridges. (.450 Bushmaster)
by Tony -
Works extremely well with thumper cartridges.
<br> (.450 bushmaster)
by john -
best buffer spring out there have them installed in all my ar's 556,300blk,7.62x39 with 10.5 in. barrels along with 4.6 oz. buffers all cycle fine