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Sprinco built this kit for folks who want to fix two of the most common cycling headaches on an AR at the same time. You get their XXP buffer spring, the highest-tension option in the lineup, matched with the XP 5-coil extractor spring. If your rifle is running hot, kicking brass forward toward the 1 o'clock zone, or you're throwing a can on the end, this is the pair that helps slow the bolt down and keeps a solid grip on the case rim through the whole cycle.
The XXP is the stoutest buffer spring Sprinco offers, sitting above their Red extra-power spring. It's aimed at carbines with excessive bolt speeds, over-gassed 14.5 and 16 inch uppers, suppressed rifles, piston guns, and pistol-caliber conversions. Like the rest of the line, it's made from ASTM Grade A877 certified valve-quality chrome silicon wire, the same stuff used in high-revving racing valve springs. Every spring gets heat treated, stress relieved, and dual-stage shot peened, then treated with a molybdenum disulfide formula that cuts wear and kills that gritty spring twang you hear with cheap action springs.
The extra-power 5-coil extractor spring runs heavier than a standard OEM spring, which means it keeps positive pressure on the extractor even when your gun is dirty or running fast. The heavier load also eliminates the need for a D-Fender ring or Crane Viton O-ring in most builds, though the kit typically ships with an insert and O-ring so you can set it up your way. It's totally reliable across all 5.56 barrel lengths and is a favorite for short-barrel and suppressed setups where extraction timing gets aggressive.
Both springs are over-engineered to outlast the duty cycle of your upper, so this is likely a one-and-done upgrade. Install takes a few minutes with basic tools, and the payoff is smoother, more consistent cycling that you'll feel at the range.
The XXP is the highest-tension buffer spring in Sprinco's lineup, so it's built for guns with excessive bolt speed. That covers over-gassed 14.5 and 16 inch carbines, suppressed rifles, piston-driven guns, and 9mm conversions. If your brass is ejecting forward toward the 1 to 2 o'clock range, this spring helps slow the carrier and pull ejection back toward 3 or 4 o'clock.
The XP 5-coil spring runs heavier than a standard OEM extractor spring, so it provides enough grip on its own to skip the D-Fender ring in most builds. The kit does include a mil-spec insert and a Viton O-ring so you can run it either way. Just don't stack both an insert and an O-ring together on the 5-coil spring.
These springs are heavily over-engineered compared to standard mil-spec parts. The chrome silicon wire and molybdenum disulfide treatment are rated for well over a million cycles, which is far more than most rifles will ever see. For practical purposes this is a one-time upgrade that should outlast your upper receiver.
Not at all. The buffer spring drops right into your receiver extension in place of the old action spring, and the extractor spring swaps out with the bolt disassembled. Most people knock it out in a few minutes with basic tools and no special gear.
| UPC | 657780257027 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 25702 |
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