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The buffer spring is one of those parts most folks never think about until it starts feeling gritty or sounding like a screen door on a rusty hinge. Strike Industries built the AR-10 Flat Wire Spring to fix that. Instead of the round wire in a factory spring, this one uses a flat wire profile that packs more coils into the same space, which means a smoother compression stroke, quieter cycling, and a return to battery that feels a lot more controlled on your .308, LR-308, or SR-25.
The flat wire shape lets the spring compress more evenly than a standard round-wire unit, so the bolt carrier gets a more consistent push through its travel. Folks running these on large-frame ARs regularly point out reduced felt recoil and the near-total disappearance of the classic AR spring "twang" after every shot. The increased bolt load paired with lower compressing force helps the action cycle reliably, which matters on .308 platforms where timing can be finicky. It's a genuinely noticeable difference for a part that costs about the same as an ordinary replacement spring.
Strike Industries makes this one from stainless steel and cryogenically cycles it, a treatment that adds consistency and helps the spring shrug off high cyclic rates over the long haul. The result is a service life that far outstrips a typical stock spring, so it's just as smart a choice for a fresh build as it is for refreshing a rifle that's got some rounds on it.
This is a drop-in swap for standard receiver extensions on AR-10, LR-308, and SR-25 rifles. No permanent modifications needed, you just pull your old spring and drop this one in. Worth knowing up front: it runs a touch longer and stiffer than a basic spring, so getting it seated over a weighted buffer can take a little muscle and a good set of needle nose pliers. It's meant for .308 systems specifically, so it isn't the right pick for a 5.56 AR-15.
It's designed to work with standard receiver extension lengths on AR-10, LR-308, and SR-25 rifles, including rifle length tubes with fixed stocks. It runs a bit longer than a basic spring, so some folks find it takes real effort to seat in a shorter carbine-length tube. Measure your setup before ordering and be ready to work it in slowly over a weighted buffer.
Yes, it's a direct replacement that requires no permanent modifications. You pull your existing buffer spring and drop this one in its place, then reassemble as normal. Because it's slightly stiffer and longer than a stock spring, a good pair of needle nose pliers makes getting it over the buffer a lot easier.
The flat wire profile gives a smoother compression stroke, and shooters running these on .308 builds regularly report reduced felt recoil and the disappearance of the usual AR spring twang on the return to battery. Results vary a little depending on your gas system and buffer weight. Pairing it with an appropriate buffer helps you get the most out of it.
No, this one is tuned specifically for .308 large-frame AR systems and it's too stiff and long for a standard AR-15. Dropping it into a 5.56 rifle can cause short stroking and cycling problems. Strike Industries makes a dedicated AR carbine flat wire spring for 5.56 builds instead.
| UPC | 708747545791 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | AR10FWS |
| Color | Silver |
| Model | |
| Product Type | Recoil Spring |
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