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The Leapers UTG PRO Ops Ready S4 is a compact, no-nonsense buttstock for anyone building or refreshing an AR-15 on a mil-spec carbine buffer tube. It's molded from impact-resistant high-strength polymer in a matte black finish, and the whole point of the design is keeping bulk down without giving up comfort. At 4.28 inches long with four positions of adjustability, it dials in a repeatable length of pull and shoulders quickly, which is especially handy when you're running body armor or a load-bearing vest that shortens your reach.
Where a lot of budget stocks feel loose, the S4 is built with tight tolerance controls so it locks up snug against the tube with minimal wobble. It ships with a slanted, ergonomic cheek rest for a natural cheek weld, plus a rubberized butt pad that keeps it planted on your shoulder. There's also a removable 5.51-inch extended cheek rest insert in the box if you want a higher, more consistent weld when running optics.
The reversible sling swivel housing works for left or right-handed setups, and there's a standard sling loop for traditional two-point slings too. That flexibility, along with the low-profile shape, makes it a solid match for SBR builds and shorter carbines where every ounce and inch counts. It pairs naturally with UTG's slim handguards if you're chasing a lean, fast-handling rig.
One thing worth flagging: this is the stock-only version, so it slides onto an existing mil-spec carbine receiver extension. If your build doesn't already have a buffer tube assembly, you'll want the full kit instead. Leapers backs it with a lifetime limited warranty, which is nice reassurance for a part that takes a beating at the range.
No, this is the stock-only version. It's made to slide onto an existing mil-spec carbine receiver extension. If you need the buffer tube, buffer, spring, end plate, and castle nut, look for the full S4 stock kit instead.
It's built for standard AR-15 mil-spec diameter carbine buffer tubes. It will not fit commercial-spec tubes, so double-check what's already on your lower before ordering.
Because it's a compact stock at 4.28 inches with four positions, the length of pull is on the shorter side, which is by design. Owners running the S4 kit report a range of roughly 7.58 to 9.53 inches depending on the tube and setup, making it a good fit for close-in shouldering with armor or optics.
Yes. The sling swivel housing is reversible for left or right-handed setups, and there's also a standard sling loop for traditional slings. That gives you flexibility no matter how you like to carry.
| UPC | 4717385552753 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | RBUS4BMS |
| Color | Black |
| Model | |
| Product Type | Stock |
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