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The Advanced Technology AR-15 Mil-Spec Buffer Tube Assembly is one of those parts you don't think much about until you need one, and it earns its keep every time the bolt cycles. Machined from 6061-T6 aluminum with a hard-coat anodized finish, the tube runs true mil-spec dimensions with a 1.19 inch thread diameter and a 1.15 inch tube diameter. That means it threads cleanly into a standard AR-15 lower and plays nice with the huge world of mil-spec carbine stocks out there.
The six positions give you room to dial in length of pull for different shooters, different gear, and different jackets when the weather turns. The steel castle nut and locking ring are E-coated for corrosion resistance and hold up a lot better than the soft nuts that ship on some budget rifles. You also get the buffer spring and recoil plug in the package, so the core of your receiver extension is covered in one box.
This kit is a solid pick whether you're assembling a lower from scratch or swapping out a worn or damaged tube. It's built for the AR-15, M16, and M4 pattern and fits most AR variants that use mil-spec dimensions. It is not made for .308 or AR-10 sized rifles, so keep that in mind if you're working on a bigger platform. Made in the USA and backed by a limited lifetime warranty, it's the kind of no-drama part that just does its job.
One thing worth knowing before you order: this is a carbine-length setup, so you'll want a matching carbine buffer weight to complete the recoil system if you don't already have one on hand. Match it with a mil-spec collapsible stock like a CTR, SOPMOD, or standard M4 style and you're ready to run.
Yes, as long as your lower and stock are mil-spec. The tube uses a 1.19 inch thread diameter and 1.15 inch tube diameter, which is the standard mil-spec size for AR-15, M16, and M4 pattern rifles. Just double-check that your collapsible stock is also mil-spec and not commercial, since those two use slightly different diameters.
No, this kit includes the buffer tube, buffer spring, recoil plug, castle nut, and locking ring, but not the buffer weight itself. You'll need a carbine buffer to complete the recoil system if you don't already have one. It's a quick and inexpensive add if you're building a lower from the ground up.
No, this is a standard AR-15 mil-spec assembly and is not compatible with .308 or AR-10 sized rifles. Those larger platforms use their own buffer tube dimensions and recoil components. ATI makes a separate assembly for .308 builds if that's what you need.
The steel E-coated castle nut in this kit is a step up from the soft nuts that come on a lot of factory guns and holds torque well. Plenty of builders stake it in place for extra insurance on rifles that see hard use. If you plan to run the gun hard, staking the nut is a smart bit of peace of mind.
| UPC | 758152900470 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | A5102240 |
| Color | Black |
| Length | 14.8500 |
| Model | |
| Product Type | Buffer Assembly |
| Style | Assembly |
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