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The UTG Pro RBU6BM is a full mil-spec carbine stock assembly built to convert a fixed-stock lower or finish off a fresh AR-15 build. Rather than piecing together a tube, buffer, and spring from three different brands, this kit hands you the whole package in one box, precision machined to keep the wobble down and the cheek weld consistent. It runs on the AR-15/M16 platform and drops right onto any lower that takes a standard mil-spec buffer tube.
The receiver extension is machined from 6061-T6 aircraft aluminum with high-strength rolled threading and a Type III hardcoat anodized finish, so it shrugs off corrosion and wear the way a working carbine tube should. The polymer buttstock is molded from impact-resistant material and slides across six positions, letting you shorten it up for a plate carrier or stretch it out for a bare t-shirt fit. It also has a built-in metal sling swivel and slots, so mounting a two-point or single-point sling is straightforward.
The kit ships with the buffer tube, a standard 3 oz carbine buffer, the action spring, castle nut, and end plate, which is everything needed to cycle properly on a direct-impingement carbine. All you really need to supply is an armorer's wrench to torque the castle nut and stake it. Fitment between the tube and stock is snug, and feedback from folks who have run it points to solid fit and finish for a value-priced assembly.
UTG Pro is the higher-tier line from Leapers, a Michigan-based company that has been making shooting and outdoor gear for decades. This particular assembly is made in the USA and backed by the UTG Pro lifetime warranty, which is a nice bit of reassurance for a part that lives at the back of your rifle and takes abuse every range trip.
Yes, it fits standard AR-15 and M16 pattern lowers along with any firearm that accepts a mil-spec diameter buffer tube. Since it uses a true mil-spec tube rather than a commercial-spec one, be sure your current stock is mil-spec if you plan to swap only the buttstock later. As a complete assembly, it replaces the entire buffer system, so it works for both fixed-stock conversions and new builds.
The kit includes the buffer tube, 3 oz buffer, spring, castle nut, and end plate, so no additional components are needed to get it running. You will want an armorer's wrench to properly torque and stake the castle nut during installation. Everything else required for the collapsible stock function comes in the box.
It uses a mil-spec diameter receiver extension machined from 6061-T6 aircraft aluminum with rolled threads and a hardcoat anodized finish. That means it accepts other mil-spec stocks down the road if you ever decide to upgrade the buttstock. The tighter mil-spec tolerances also help cut down on stock wobble.
It ships with a standard 3 oz carbine buffer paired with a carbine action spring, which is the typical setup for a direct-impingement carbine-length gas system. This combination handles reliable cycling for most standard AR-15 builds. If you are running a heavily suppressed or non-standard gas setup, you may eventually want to tune the buffer weight to match.
| UPC | 4712274528277 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | RBU6BM |
| Color | AR-15 STOCK ASSEMBLY |
| Length | 9.1000 |
| Model | |
| Product Type | Buttstock Kit |
| Shipping Weight | 1.2375 |
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