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Timber Creek Outdoors built this kit for folks putting together an AR-15 lower and wanting the whole rear assembly handled in one shot. Instead of chasing down a tube here and a castle nut there, you get the mil-spec carbine buffer tube, a quick disconnect end plate, castle nut, buffer, spring, and the detent pin all in one box. The blue anodized finish is the real draw here, giving your build a splash of personality while still keeping everything to standard dimensions so nothing about the fit gets weird.
This is a mil-spec 1.148-inch diameter tube, which matters more than it sounds. That spec is the standard the vast majority of AR-15 stocks are built around, so stocks from Magpul, BCM, Luth-AR and plenty of others slide right on and lock up tight. The six-position carbine-length extension gives you the adjustment range most people want out of a collapsible stock setup, and the quick disconnect end plate adds a sling mount point without needing extra hardware.
Installation is familiar territory if you've ever assembled an AR lower. The tube threads onto the standard receiver extension threads, you seat the buffer detent and spring, slide the tube in, snug the castle nut with a wrench, and stake it if you want it locked for good. Everything is machined to fit cleanly, so you're not fighting parts to get them seated. A castle nut wrench is the one tool you'll want on hand to torque things down properly.
The buffer and spring included run standard carbine weight, so cycling stays smooth and reliable with typical loads. Whether you're finishing a fresh build or swapping out a tired, mismatched rear end on an existing rifle, this kit ties it all together and lets you match it to the rest of a color-themed Timber Creek setup or just make one rifle stand out from the safe.
This is a true mil-spec diameter carbine tube, measuring 1.148 inches, which is the standard almost every AR-15 stock is built to fit. That means collapsible stocks from Magpul, BCM, Luth-AR, and most other major brands will slide on and lock into position without issue. Just make sure the stock you're pairing it with is labeled mil-spec rather than commercial spec.
For the rear assembly, yes. You get the buffer tube, quick disconnect end plate, castle nut, buffer, spring, and the detent pin, so the whole receiver extension end is covered. You'll still need a lower receiver, a stock, and the takedown pin detent hardware if those aren't already installed.
A castle nut wrench is the main tool you'll want so you can properly torque the castle nut against the receiver. Beyond that it's a straightforward assembly using the standard receiver extension threads. Many builders also stake the castle nut afterward to keep it from backing out under recoil.
This kit is set up as a carbine-length AR-15 assembly with an AR-15 carbine buffer and spring. Some retailers list the mil-spec tube itself as compatible with AR-10/308 lowers, but the included buffer and spring are AR-15 carbine spec, so a .308 build would need the correct heavier buffer and spring for that platform.
| UPC | 816397027830 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | ARBTKB |
| Product Type | Buffer Assembly |
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