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This is Sprinco's Red spring, their extra power buffer spring and the one that started the whole lineup back in 2006 when the company was tasked with fixing spring-related reliability problems on M4 carbines. It carries roughly 25% more design load than a standard mil-spec spring, which is exactly what you want when a rifle is running hot and slinging brass too far forward. If your build is over-gassed, wearing a can, or chambered in something with more thump than 5.56, this spring gives you the tension to slow that bolt down and get everything cycling the way it should.
On the .308 side, the Red is the right call for moderately gassed AR-10 and SR-25 pattern rifles, think Armalite, LMT, LaRue, and KAC style guns that use deeper receiver extensions with 3.25 inch carbine buffers to make room for the longer bolt carrier. It's not the pick for DPMS pattern .308 carbines running the short 7 inch M4 tube and stubby 2.5 inch buffer, that platform wants Sprinco's Orange spring instead. Getting the tube depth and buffer style matched up is the whole ballgame here, so it pays to know which pattern your lower is before you order.
These are made from ASTM certified valve quality chrome silicon wire, the same stuff used in Formula One and high-cycle motor valve springs. Every spring gets heat treated, stress relieved, and dual stage shot-peened after winding, then impregnated with a re-micronized molybdenum disulfide formula that cuts down mechanical wear and kills that annoying spring twang you hear on cheap springs. The payoff is consistent spring pressure across the whole duty cycle and a part that holds its performance for hundreds of thousands of rounds instead of needing swapped every 5,000.
Beyond .308 duty, the Red is a proven fix for heavily over-gassed 5.56 guns and thumper calibers like 6.8 SPC, 6.5 Grendel, .450 Bushmaster, .458 SOCOM, and .500 Beowulf. Pair it with the right buffer weight and you can dial recoil and ejection to right where you want them.
It's the right choice for moderately gassed AR-10 and SR-25 pattern .308 rifles that use a deeper receiver extension with a 3.25 inch carbine buffer, like Armalite, LMT, LaRue, and KAC style guns. It is not meant for DPMS pattern .308 carbines that run the standard 7 inch M4 tube and short 2.5 inch buffer, those need Sprinco's Orange spring. Check which pattern your lower uses before ordering.
It adds spring tension, roughly 25% more than a standard mil-spec spring, which slows down bolt velocity as the action cycles. That helps calm over-gassed rifles, reduces felt recoil, and brings ejection patterns back to a sensible clock position. It's one of the simplest ways to tune reliability on a hot-running gun.
A long time. Standard action springs are wear items that many folks replace around every 5,000 rounds, while Sprinco's chrome silicon springs are built to hold their performance for hundreds of thousands of cycles. The heat treating, shot-peening, and moly coating are what let it keep consistent pressure over the life of the rifle.
Yes. The Red is a favorite for over-gassed 5.56 builds and thumper cartridges like 6.8 SPC, 6.5 Grendel, .450 Bushmaster, .458 SOCOM, and .500 Beowulf. Pairing it with the correct buffer weight lets you fine tune recoil and cycling for your specific setup.
| UPC | 657780250042 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 25004 |
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