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The UTG PRO Ops Ready S4 is one of the shortest stocks in the game, and that's the whole point. At just 4.28 inches, it hugs close to the receiver extension for a beyond-sub-compact footprint that shines on SBR builds and any rifle where you want to trim bulk and weight. The body is molded from impact-resistant, high-strength matte black polymer, so it takes a beating and keeps a clean, no-nonsense look that pairs with just about any build.
Don't let the compact size fool you into thinking comfort took a back seat. UTG built in an integral slanted cheek rest and tossed in a removable extended cheek rest insert, so you can dial in your cheek weld for optics or irons. A rubberized butt pad keeps it planted in your shoulder pocket, and the four-position adjustability lets you tune length of pull whether you're running a plate carrier, a heavy jacket, or nothing at all. Folks with smaller frames tend to love how narrow it sits compared to a standard M4 stock.
This is a full kit, not just a stock body. It ships with the mil-spec carbine receiver extension tube, buffer, buffer spring, receiver end plate, and castle nut, meaning you have all the hardware to complete a lower or swap out an old assembly in one go. It also carries a reversible sling swivel socket for left or right-handed setups plus a standard loop for traditional slings, so you're covered no matter how you carry.
UTG builds these with tight tolerance controls for a secure fit and minimal wobble, and the whole assembly is proudly designed and made in the USA. Pair it with a slim handguard and you've got a trim, fast-handling carbine that's easy to shoulder and easy to live with.
No, this is a complete kit. It comes with the mil-spec buffer tube, buffer, buffer spring, end plate, and castle nut, so you have all the hardware to finish a lower or replace an existing carbine stock assembly. You'll just want a castle nut wrench and an armorer's tool to lock it down properly.
Yes, it's built to mil-spec dimensions, so it fits standard mil-spec AR-15 and M4 carbine buffer tubes. Since the kit includes its own tube, you can also build from scratch on a bare lower. Just confirm your receiver takes a mil-spec extension rather than a commercial one if you're only swapping the stock body.
At 4.28 inches, it's noticeably shorter and narrower than a typical M4-style stock, which is why it's a favorite for SBR builds and anyone wanting to shed bulk. The slim profile makes it comfortable for smaller-framed users and easy to shoulder while wearing a plate carrier. You still get a full cheek weld thanks to the slanted rest and the removable extended insert.
It does. There's a reversible sling swivel socket that works for both left and right-handed setups, plus a standard slot for a traditional sling loop. That gives you flexibility to run a modern QD-style sling or an old-school loop depending on your rig.
| UPC | 4717385552678 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | RBUS4BM |
| Model | |
| Product Type | Stock |
| Color | Black |
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