UTG Pro AR15 Ops Ready S4 Mil-spec Stock Kit

• Compact 4-position stock design: The short S4 profile keeps the rifle trim and easy to handle, which is especially useful on compact AR15 builds and in confined shooting positions.
• Complete mil-spec stock kit: The package includes the stock, mil-spec extension tube, buffer, buffer spring, receiver end plate, and castle nut, making it a practical choice for a full rear-end build or replacement.
• Impact-resistant polymer construction: The stock body is molded from high-strength polymer to keep weight down while standing up to regular field and range use.
• Ergonomic cheek rest and rubberized butt pad: These features improve shoulder purchase and cheek weld, helping the rifle feel more stable during rapid handling and repeated shots.
• Ambidextrous sling setup: A reversible sling swivel housing and standard sling loop give left- and right-handed shooters flexible carry and retention options.

About the UTG Accessories Series

UTG Accessories covers a broad part of the Leapers catalog, bringing together practical components for rifles as well as support items for optics and shooting equipment. The series sits in the brand’s accessible, hard-use segment, with products intended for shooters who want dependable function for range work, hunting setups, and general rifle configuration without unnecessary complexity. Within the wider lineup, UTG accessories range from optical support items such as scope add-ons to firearm components including rails, handguards, and stock-related parts.

A defining trait of the series is its focus on useful design choices rather than ornament. In the rifle category, that means compact profiles, straightforward installation, and compatibility with common platforms such as the AR15. Across the range, the design philosophy emphasizes practical ergonomics, durable materials, and configurations that support real shooting use. The result is a family of accessories that fits naturally into modern sporting rifle builds, whether the goal is a lighter handling carbine, a more adaptable training rifle, or a cleaner overall setup with parts that work together sensibly.

About the UTG Pro AR15 Ops Ready S4 Mil-spec Stock Kit

The UTG Pro AR15 Ops Ready S4 Mil-spec Stock Kit is built for shooters who want a compact AR stock assembly with the essential hardware already included. Its 4-position adjustable layout gives the rifle a useful range of length-of-pull settings, helping it adapt to different shooting stances, body sizes, and gear. On carbines set up for training, defensive use, or general-purpose field carry, that adjustability makes the rifle easier to shoulder quickly and more comfortable to run over longer sessions.

The S4 stock uses a minimal-bulk profile that keeps the rear of the rifle slim, which benefits compact builds and helps the carbine move more freely around barriers, vehicles, or tight indoor spaces. UTG pairs that compact shape with an ergonomic slanted cheek rest and a rubberized butt pad, so the stock does not feel stripped down in actual use. The cheek support promotes a more repeatable head position, while the butt pad adds grip against clothing and gear during rapid mounting.

This kit also stands out because it is supplied as a complete assembly. Along with the stock body, it includes the mil-spec extension tube, buffer, buffer spring, receiver end plate, and castle nut. That makes it well suited to new builds and straightforward rear-end replacements. The stock body is molded from impact-resistant polymer, and the sling arrangement combines a reversible sling swivel housing with a standard sling loop, giving both left- and right-handed shooters flexible carry options.

About UTG

UTG is a brand of Leapers, Inc., a Michigan company founded in 1992 and headquartered in Livonia, Michigan. Leapers has long focused on optics and shooting-sport accessories, covering product categories such as riflescopes, mounts, rings, bipods, and firearm components. Its first product was a compact 4×28 scope, and the company later expanded into a much broader catalog for sporting and tactical rifle platforms.

Within that portfolio, UTG is known for practical, shooter-oriented equipment, while the UTG PRO line introduced in 2009 highlights U.S.-made products for key accessory categories. Leapers has also continued to invest in optics development, including a dedicated optics research and manufacturing center in Taiwan established in 2018. For products such as AR stocks and rifle accessories, that background matters because it reflects a long-standing specialization in parts designed around compatibility, durability, and everyday use on modern sporting rifles.

Main Features

• Manufacturer: UTG
• Series: UTG Accessories
• Made in: USA
• Compatible with: Rifles
• Material: Polymer
• Weight: 485.00 g
• Height: 121.00 mm
• Length: 109.00 mm

Warranty

This product is covered by a 10-year warranty. That stated term gives clear long-term support for normal ownership and use.

In the Box

• UTG Pro AR15 Ops Ready S4 Mil-spec stock
• Mil-spec extension tube
• Buffer
• Buffer spring
• Receiver end plate
• Castle nut
• Extended cheek rest insert