Sprinco M4 / AR-15 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
Great spring, but not for 12.5" carbine length barrel
Great spring, but not optimal for my system:
<br>12.5" BCM carbine length barrel
<br>H1 buffer, also tried standard buffer weight
<br>Wouldn't lock back on last round. Gonna try a blue spring.
Shells going past 3 o’clock
by Ramiro -
Shells going past 3 o’clock the spring well definitely help; It won’t be the only step you’ll need to bring your shells ejecting at 3 o’clock but it’ll help and It’s a really good spring.