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The extractor spring is one of those tiny parts nobody thinks about until a case rim slips and the gun stops running. Sprinco built this Enhanced 4-Coil kit to end that worry. It's a plug-and-play upgrade for AR-15 bolt carrier groups, and this triple pack hands you three full sets so you can outfit multiple rifles or stash spares in the range bag.
The 4-Coil spring is tuned to hold the load of a fresh Mil-Spec spring over an extended duty cycle, which makes it the smart pick for 18-inch and longer barrels. It's a little gentler on case rims than the stouter 5-Coil version, so if you retrieve your brass for reloading, this is the one you want. Longer dwell times on those barrels mean you don't need the aggressive grip of the extra-power spring, and the 4-Coil keeps your cases in better shape.
Sprinco makes these springs from chrome silicon wire stock that gets heat treated, stress relieved, and cryogenically processed after winding. That cryo step actually changes the grain structure of the metal, which adds wear life and strength. On top of that, the spring is plated with a re-micronized molybdenum disulfide formulation to cut friction, and it stays unaffected by heat up to 750 degrees Fahrenheit. Sprinco has documented a single extractor spring running past 200,000 rounds, so durability isn't just marketing talk here.
Each kit includes the spring, a Mil-Spec black extractor insert, and a Viton O-ring. With the 4-Coil spring, most folks run the spring and insert together. Swapping it out takes about ten minutes with no special tools, no modification to the platform, and no fuss. It drops right into a standard 5.56 NATO, .223 Rem, or 300 Blackout bolt. For a lot of builders, this is the last extractor spring the bolt will ever need.
The Enhanced 4-Coil spring is built for barrels 18 inches and longer, and it's the better choice if you save your brass for reloading since it's less aggressive on case rims. The Extra Power 5-Coil is meant for 16-inch and shorter barrels where quicker dwell times demand a harder grip. Match the spring to your barrel length and you'll be set.
With the 4-Coil spring, most people run the spring and the Mil-Spec black insert together. The O-ring adds extra tension on the extractor and is more commonly used as an option depending on your setup, so plenty of builders leave it out. The spring itself is the non-negotiable part.
It drops into standard AR-15 and M4 bolt carrier groups chambered in 5.56 NATO, .223 Rem, and 300 Blackout. Installation is plug-and-play with no modification to the platform. If you've got a standard Mil-Spec bolt, this will fit.
Sprinco has documented a single extractor spring running past 200,000 rounds and still holding spec. The chrome silicon construction, cryogenic processing, and moly disulfide plating are all built for extreme duty cycles. For many bolts this ends up being the only extractor spring you'll ever need to install.
| UPC | 657780264032 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 26403 |
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