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Finishing an AR-15 lower shouldn't mean chasing down five separate parts from five different bins, and the UTG Pro TLU001-KIT solves that in one shot. This kit bundles a mil-spec 6-position receiver extension tube together with the carbine buffer, buffer spring, castle nut, and receiver end plate, so you have the full buffer assembly ready to bolt on a collapsible stock. The tube is CNC machined from 6061-T6 aircraft-grade aluminum and wears a matte black Type III Class II hardcoat anodized finish that holds up to real use.
The receiver extension features precisely rolled threads rather than cut threads, which gives you cleaner, stronger engagement with the lower receiver. UTG runs these through tight tolerance controls so the fit stays snug across a range of mil-spec collapsible stocks, which cuts down on the wobble that plagues cheaper tubes. Since it's a true mil-spec diameter, any mil-spec adjustable stock you already own or plan to buy will slide right on.
Installation is straightforward for anyone who has assembled a lower before. You'll thread the tube into the receiver, capture the buffer retainer and spring, run the end plate and castle nut down, then stake the castle nut to keep everything locked in place. The carbine buffer and spring included in the kit are matched to standard direct-impingement carbine builds, so there's no guesswork on buffer weight for a basic setup.
UTG Pro is the higher-end line from Leapers, and this kit reflects that with a proudly made-in-USA build and a lifetime warranty backing it. It weighs in around 9.3 ounces for the complete kit and measures about 7.25 inches long, keeping things light without giving up strength. For anyone putting together a first AR or restocking parts for a shop build, it's a dependable, no-drama way to get a lower ready for a stock.
The kit includes a mil-spec 6-position receiver extension tube, a carbine buffer, a buffer spring, a receiver end plate, and a castle nut. That covers the full buffer assembly you need to mount a collapsible stock on an AR-15 lower. You'll just supply the stock itself.
Yes. The tube is a true mil-spec diameter, so any mil-spec adjustable AR-15 stock will slide right on and lock into the six positions. Commercial-spec stocks will not fit this tube, so double check which type of stock you're running.
It is. UTG Pro is the premium line from Leapers, and this kit is CNC machined and assembled in the USA. It's also backed by a lifetime warranty.
Yes, the included carbine buffer and spring are sized for a standard direct-impingement carbine setup, so it drops into most common 5.56/.223 builds without extra parts. If you're running a specialty setup like a suppressed or pistol-caliber build, you may want to fine-tune the buffer weight separately.
| UPC | 4717385551961 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | TLU001KIT |
| Product Type | Buffer Assembly |
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