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Building out an AR-15 lower or swapping in a collapsible stock means you need a solid receiver extension, and the Armaspec Carbine Buffer Tube Kit covers the core hardware to make that happen. It brings together a six-position buffer tube, a steel castle nut, and an end plate, all finished in black to blend right into a standard black rifle. Armaspec has been building AR, Glock, AK, and 1911 parts in the U.S. since 2013, and this kit fits right into their AR-15 lineup as a no-drama option for builders and gunsmiths alike.
The heart of this kit is a mil-spec 7075-T6 aluminum buffer tube with six adjustment positions, so you can dial in length of pull to fit the shooter and the shooting position. That 7075-T6 spec is the tougher aluminum alloy you want in a part that takes a beating from the bolt carrier cycling back and forth. The included end plate keeps your rear takedown pin detent and spring captured, while the steel castle nut threads down to lock the whole assembly against the vibration of firing.
Installation is straightforward if you've built a lower before. Thread the tube into the receiver until it holds the buffer retainer, seat the end plate over the takedown pin detent and spring, then snug the castle nut down with an armorer's wrench. A lot of builders stake the castle nut into the end plate notches to make sure it never backs off, which is smart on a rifle that sees regular range time or hard use. Do note this kit is the tube-and-hardware package, so you'll want a compatible carbine buffer and action spring plus your stock of choice to finish the job.
If you're piecing together a build or refreshing an older setup, this is a dependable, USA-made foundation to work from at a price that leaves room in the budget for the fun parts.
This kit includes a mil-spec 7075-T6 six-position buffer tube, a steel castle nut, and an end plate. It gives you the receiver extension hardware needed to mount a carbine-style collapsible stock to an AR-15 lower. You'll need to add a carbine buffer, action spring, and your stock to complete the build.
Yes. The six-position tube is machined to mil-spec dimensions, so it accepts the wide range of carbine-style adjustable stocks built for standard AR-15 receiver extensions. If your stock says mil-spec carbine, it should slide right on.
Staking is a good idea on any rifle that sees regular or hard use, since it deforms end plate material into the castle nut notches to keep it from backing off under recoil vibration. It's how mil-spec rifles are set up. For an occasional range gun it isn't strictly required, but many builders do it anyway for peace of mind.
An armorer's wrench is the main tool for tightening the castle nut, and a lower vise block helps hold everything steady on the bench. If you plan to stake the castle nut, you'll also want a center punch and a hammer, or a spring-loaded punch.
| UPC | 810048492916 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | ARM621-C |
| Model | |
| Color | Black |
| Product Type | Buffer Tube |
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