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The Luth-AR .223/5.56 Mil-Spec Carbine Buffer Tube Assembly Kit takes care of everything at the rear of your AR-15 lower in a single package. It ships already assembled, so whether you are wrapping up a fresh build or swapping tired parts on a rifle that has seen some rounds, you are pretty much ready to thread it in and go. The tube is machined from 6061-T6 aluminum with a black hardcoat anodized finish, giving you the corrosion resistance and durability you want out of a part that lives right in the recoil path.
Inside the box you get the mil-spec six-position receiver extension, a properly weighted 3.2 oz carbine buffer, a carbine recoil spring, the castle nut, and the receiver end plate. That is the full stack of components needed to run a collapsible carbine stock, and since it is all built to mil-spec dimensions, it plays nice with the vast majority of standard M4-style stocks on the market. Total assembly weight lands right around 11.6 oz.
This is a mil-spec diameter tube, not commercial, which is the more common and widely supported spec these days. The six position slots let you dial in length of pull for different body types, gear, or shooting positions, so the setup works just as well for a range gun as it does a home-defense build. The carbine spring and 3.2 oz buffer are matched to a carbine-length gas system, which keeps cycling smooth and predictable.
Installation is straightforward if you have the right tools. An armorer's wrench for the castle nut and a vise block to hold the lower steady will make the job clean and painless. Keep in mind the buffer retainer and its spring live in the lower receiver itself and are not part of this kit, so make sure your lower already has those in place. It is built for carbine-length setups, so it is not the right choice if you are running a rifle-length gas system. Luth-AR builds these in the USA to tight tolerances, which is a big part of why they have a solid reputation among folks putting together dependable ARs.
Yes, the kit ships fully assembled and ready to install. You will still need to thread the receiver extension into your lower and torque down the castle nut, but the components come together in one complete package. That makes it a quick way to finish a build or replace worn parts.
An AR-15 armorer's wrench is the key tool for seating and tightening the castle nut, and a vise block to hold your lower receiver steady makes the whole job easier and safer. A punch helps when capturing the buffer retainer as you thread the tube in. Many folks also torque the castle nut to spec and stake it so it stays put under recoil.
It is a mil-spec diameter tube, so it pairs with the large majority of standard collapsible M4-style carbine stocks. Just make sure your stock is built for mil-spec and not commercial diameter, since the two are not interchangeable. Mil-spec is the more widely supported spec, so options are plentiful.
No, the buffer retainer and its detent spring are part of the lower receiver, not this kit. You will need those already installed in your lower before you thread on the buffer tube. The kit covers the receiver extension, buffer, buffer spring, castle nut, and end plate.
| UPC | 859819007096 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | 223-M-BAP |
| Product Type | Buffer Tube Complete Assembly |
| Style | Mil-Spec |
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