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Anyone who has built an AR-15 lower knows the moment: you drop in the buffer retainer, thread on the buffer tube, and that tiny spring decides to make a break for it across the room. This 10-pack from LBE Unlimited exists for exactly that reason. It gives you a stack of steel replacement springs so a lost or tired detent spring never brings your build or your range day to a halt.
This little coil spring sits under the buffer retainer pin in the rear of the lower receiver, right behind the magazine well. It keeps constant upward pressure on the retainer so the buffer and recoil spring stay captured when you hinge the upper open for cleaning or charging. Without it, the buffer walks forward and pops loose the second you separate the receivers. Getting the length and tension right matters here, and these are cut to standard AR-15 geometry so the detent rides where it should.
This is a wear-and-loss part more than a wear-and-fail part. It rarely breaks, but it loves to disappear during a buffer tube install or get bent by a slipped pin. Keeping ten on hand means builders, armorers, and anyone running more than one AR never has to pause a project over a fifty-cent piece. Toss a few in your range bag, stash the rest on the bench, and you are covered for the next several builds.
The springs are steel and made in the USA, which is what you want in a small part that has to hold tension over the long haul. Whether you are assembling a fresh lower, repairing a rifle where the original went missing, or just restocking the parts drawer, these do the job without any fuss.
It sits under the buffer retainer pin at the rear of the lower receiver and pushes the detent up against the buffer. That upward pressure keeps the buffer and recoil spring captured so they do not pop forward when you hinge the upper open for cleaning or charging. It is small, but the rifle will not stay assembled properly without it.
Drop the spring into its pocket at the back of the magwell tower, set the retainer pin on top, and keep a thumb over it so it does not launch. Then thread the buffer tube forward far enough to capture the detent before backing off to align your castle nut and end plate. It takes a minute once you have done it a couple times.
This is a part that gets lost far more often than it wears out, usually launching across the room during a buffer tube install. Having ten on hand means builders, armorers, and anyone running multiple ARs never has to stop a project over one tiny spring. Keep some at the bench and toss a few in the range bag.
Yes. These are cut to standard AR-15 and M4-pattern geometry, so they drop into the buffer retainer pocket on a mil-spec lower receiver. Correct length matters with this part, since a short or set spring lets the detent drop too low and the buffer can slip loose.
| UPC | 765857617701 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | ARBRPS |
| Color | Black |
| Model |
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