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The UTG Pro Model 4 S3 Ops Ready Stock Kit is one of those upgrades that punches well above its weight class. Instead of buying a bare stock and then chasing down a buffer tube, buffer, spring, and hardware separately, this kit hands you the whole package so you can finish a lower or swap out a tired factory stock in one sitting. It's a mil-spec six-position setup, so it fits standard carbine buffer tubes and adjusts to five points of length of pull for a comfortable fit no matter your build or how you're layered up.
The S3 leans toward the minimalist crowd. It runs a compact 6.05-inch length with a sub-compact profile, keeping weight down without giving up a usable cheek rest. The slanted cheek surface and rubberized butt pad help you settle into a repeatable position and hold zero on target, while the fully dehorned corners and melted contours mean nothing catches on a sling, gear, or the edge of a truck seat. Folks running lightweight builds have found it holds its own next to pricier name-brand stocks, and it plays nice with both single-point and two-point slings.
The stock body is molded from impact-resistant high-strength polymer, and the mil-spec diameter extension tube is precision machined from aircraft-grade aluminum with rolled threads, then anodized to fight off corrosion and wear. Integral ambidextrous sling loops and a QD sling swivel housing give lefties and righties equal footing. It's proudly designed and made in the USA and carries the UTG Pro lifetime warranty, which says a lot about how they expect it to hold up.
This is a true assembly kit, not just a shell. You get the polymer stock plus the full hardware set, so a lower that's ready for a stock becomes a shooting rifle with a wrench and a few minutes of work. Pair it with a UTG Pro Super Slim handguard and you've got a clean, lightweight setup that feels dialed in from front to back.
Yes, it's designed for standard AR-15, M16, and M4 lowers that use a mil-spec carbine buffer tube. Because the kit includes the mil-spec diameter extension tube, buffer, and spring, it works on any standard lower without needing extra parts. If your rifle uses a commercial-spec tube, this kit swaps that out entirely since it comes with its own mil-spec tube.
It's a complete assembly, so you get the polymer stock, the mil-spec 6-position extension tube, a carbine buffer, buffer spring, the tear-drop receiver end plate, and the castle nut. That means everything you need to finish a stripped lower or replace a full factory setup in one box. All you'll need is a castle nut wrench and a few minutes.
It's a strong fit for minimalist and lightweight builds. The compact 6.05-inch length and slim profile keep it trim while still giving you a solid cheek weld thanks to the slanted cheek rest and rubberized butt pad. Owners running lightweight components have noted it feels right at home and stacks up well against more expensive stocks.
It does. The stock features an integral ambidextrous sling loop plus a QD sling swivel housing, so lefties and righties are covered. That setup handles single-point bungee slings and standard two-point QD slings without any extra adapters.
| UPC | 4717385551831 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | RBUS3BM |
| Color | Black |
| Model | |
| Product Type | Stock |
| Shipping Weight | 1.335 |
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