The UTG Pro Ops Ready S1 Mil-Spec Stock Kit in black (brand part number RBUS1BM) is built for heavy-duty AR-15/M16 use with tight tolerance controls for a secure fit. UTG molds the stock body from impact-resistant high-strength polymer and precision-machines the mil-spec diameter extension tube from aircraft-grade aluminum with rolled threads, then anodizes it for corrosion and wear resistance. A chamfered, rubberized butt pad and slanted cheek rest improve shooting stability, and dual storage compartments with removable waterproof caps hold up to 8 CR123 batteries or other small gear. The kit includes the polymer stock, mil-spec 6-position extension tube, buffer, buffer spring, tear-drop sling ring, and castle nut, and it’s proudly made in the USA.

Key Specifications

• Fits AR-15 and M16 mil-spec receiver extensions.
• 6-Position adjustable over an 8-inch mil-spec extension tube.
• Body molded from impact-resistant high-strength polymer.
• Extension tube is anodized aircraft-grade aluminum with rolled threads.
• Dual Waterproof Storage Compartments hold up to 8 CR123 batteries.
• Integral Ambidextrous Sling Loop and QD mount points.
• Includes stock, extension tube, buffer, spring, sling ring, and castle nut.
• Made in the USA.

Frequently Asked Questions

What does the kit include? The polymer stock, mil-spec 6-position extension tube, buffer, buffer spring, tear-drop sling ring, and castle nut.

How much storage does it have? Two waterproof-capped compartments that hold up to 8 CR123 batteries or other small gear.

How long is the extension tube? It’s an 8-inch, 6-position mil-spec extension tube.

Buy the UTG Pro Ops Ready S1 Mil-Spec Stock Kit, Black, 6-Position, for AR-15/M16

Complete your build with a UTG Pro stock kit from our rifle stocks selection. Order online and we’ll ship it straight to your door from our Lubbock, Texas gun shop.