$69.97
6 in stock
Online inventory may differ from in-store availability.
Quick turnaround so you get your gear sooner.
Trusted checkout with industry-standard protection.
Keeping Traditions Alive Since 1953
Secure Transactions provided with 
The UTG Pro Model 4 S1 is one of those upgrades that punches well above what you'd expect. It's a full six-position collapsible stock kit built around a mil-spec diameter buffer tube, and it comes with all the hardware to get a bare lower running or to swap out a stock you've outgrown. The stock body is molded from impact-resistant, high-strength polymer, while the extension tube is machined from aircraft-grade aluminum with rolled threads and hard-coat anodizing for corrosion and wear resistance.
UTG paid attention to the details that matter when the rifle's actually up on your shoulder. There's a thick rubberized butt pad to soak up recoil, chamfered front and rear edges, and a slanted cheek rest that gives you a repeatable, comfortable weld behind glass or irons. Folks who've run this alongside pricier name-brand SOPMOD-style stocks tend to say the cheek weld and lockup feel right in the same neighborhood. The fully de-horned corners and melted contours keep it from snagging on slings, gear, and clothing when you're moving.
The S1 gives you real flexibility for carry setups with an integral ambidextrous sling loop plus a reversible QD sling swivel housing, so lefties and righties both get a clean attachment point. There are also two storage compartments capped with removable waterproof covers, handy for stashing spare CR123 batteries or small parts and keeping them dry in the field.
This kit is designed to drop onto most AR-15 and M4-pattern rifles, and it comes complete with the polymer stock, mil-spec six-position extension tube, buffer, buffer spring, tear-drop ring, and castle nut. The tight tolerances mean minimal wobble on a properly sized mil-spec tube, and the flush adjustment lever is easy to work under recoil. It's a straightforward install for anyone comfortable with a castle nut wrench, and it's backed by UTG Pro's warranty.
This is a complete kit, not just a stock body. You get the polymer buttstock, a mil-spec six-position extension tube, the buffer, buffer spring, tear-drop ring, and castle nut. That means everything needed to build out a bare lower or replace an existing carbine stock assembly is in the box.
Yes, it's built for most standard AR-15 and M4-pattern rifles running a mil-spec diameter buffer tube. Since the kit already includes its own mil-spec tube and hardware, you don't need to source those separately. If you're only swapping the stock body onto an existing mil-spec tube, it slides right on without removing the tube.
The S1 is built to tight tolerances and locks up solid on a correctly sized mil-spec tube, with users often comparing its fit favorably to higher-priced name-brand stocks. Like most collapsible stocks, a little play is normal before it's cinched to the position you want. Making sure it's mounted on a true mil-spec tube keeps rattle to a minimum.
The kit ships with a standard carbine buffer and spring set up for 5.56/.223-class rifles. If you're building something in .308 or a heavier-recoiling caliber, you'll want to pair it with the appropriate buffer and spring for that platform. The stock body and tube themselves are fine either way.
| UPC | 4717385550896 |
|---|---|
| Manufacturer | |
| Manufacturer Part Number | RBUS1BM |
| Color | Black |
| Model | |
| Product Type | Buttstock Kit |
You must be logged in to post a review.
Reviews
There are no reviews yet.