Sprinco M4 / AR-15 Red Extra Power Carbine Buffer Spring

Manufactured by Sprinco USA
SKU: 25004
MPN: 25004
Manufactured by Sprinco USA
5 Reviews

In Stock

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Sprinco AR-15 carbine buffer springs are made from high quality Chrome Silicon wire stock which is used in a variety of applications from Formula One to motor valve springs which can see up to 15,000,000 compression cycles in a single race. This makes it the perfect choice for a carbine which will see far less cycles than that over it’s lifetime. In order for this carbine buffer spring to retain its strength, Sprinco heat treats, shot peens, and treats each spring with a proprietary formula that retains spring efficiency for as long as you have your rifle. The Sprinco extra power carbine buffer spring is a great option to improve the long-term reliability of your AR-15.

  • 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.
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BrandSprinco USA
MaterialSteel - Chrome Silicon
California Prop 65 warning

 WARNING: This product can expose you to chemicals, which are known to the State of California to cause Cancer and Reproductive Harm. For more information go to www.P65Warnings.ca.gov.

Ratings & Reviews

5 reviews

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A must have for thumper cartridges. (.450 Bushmaster)

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Works extremely well with thumper cartridges.
(.450 bushmaster)

great spring

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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:
12.5" BCM carbine length barrel
H1 buffer, also tried standard buffer weight
Wouldn't lock back on last round. Gonna try a blue spring.

Shells going past 3 o’clock

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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.

Not Heavy Enough for PCC build

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For my personal build, this spring is not even close, to being Heavy Enough, for my 45acp PCC, maybe it will work for you.