UTG Pro AR15 Ops Ready S4 Mil-spec Stock

• Compact 4-position design: The short S4 profile keeps the rifle trim and easy to shoulder, while four adjustment positions help tailor length of pull for different shooting stances, body armor, or layered clothing.
• Impact-resistant polymer construction: The stock body uses strong polymer to keep weight down without adding unnecessary bulk, which helps maintain fast handling on AR15 builds.
• Ergonomic cheek rest and rubberized butt pad: The slanted cheek rest supports a more consistent head position, and the butt pad helps the rifle stay planted during rapid handling and repeated firing.
• Ambidextrous sling accommodation: A reversible sling swivel housing supports left- or right-handed setup, while the standard sling loop also works with more traditional carry arrangements.
• Complete mil-spec stock kit: This version includes the extension tube, buffer, buffer spring, receiver end plate, and castle nut, making it a practical choice for a full mil-spec carbine stock installation.

About the UTG Accessories Series

UTG Accessories covers a broad range of firearm components and optics-related parts built around practical use in the field and on the range. As part of the UTG catalog from Leapers, this series includes everything from small scope accessories to larger rifle components, giving shooters a consistent design language across different parts of a build. The range is positioned for users who want functional, durable equipment for sporting rifles, hunting setups, and general shooting applications.

Within the series, the emphasis is on straightforward mechanical design, dependable fit, and compatibility with common platforms. That makes UTG Accessories especially relevant for AR-pattern rifles, where stock geometry, mounting interfaces, and overall handling matter as much as raw durability. The line also reflects Leapers' long-standing focus on shooting-sport accessories since 1992, with products that are meant to solve practical setup needs rather than add unnecessary complexity. In use, the series stands out for compact profiles, sensible materials, and configurations that support both traditional and modern rifle setups.

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

The UTG Pro AR15 Ops Ready S4 Mil-spec Stock is a compact adjustable AR stock designed for shooters who want a shorter, lighter rear-end setup without giving up practical support features. Its 4-position layout gives enough adjustment to adapt the rifle to different body sizes, shooting positions, and gear, while the reduced overall profile helps keep the carbine quick to mount and easier to maneuver in confined spaces. That makes it especially well suited to compact AR15 builds, training carbines, and rifles configured for fast handling.

The stock body is made from polymer, which keeps weight under control while still providing the rigidity needed for regular use. UTG pairs that compact shell with an ergonomic slanted cheek rest, helping the shooter settle into a more repeatable head position for better sight alignment. A rubberized butt pad improves shoulder purchase, which is useful when driving the rifle quickly between targets or maintaining control during repeated strings of fire. The reversible sling swivel housing supports left- or right-handed sling setup, and the standard sling loop adds flexibility for more conventional carry methods.

This RBUS4BMSc configuration is also a complete stock kit rather than a stock body alone. In practical terms, that means it comes with the mil-spec extension tube, buffer, buffer spring, receiver end plate, and castle nut, making it a convenient option for a full mil-spec carbine stock installation. At 204.00 g for the stock itself and with compact dimensions of 121.00 mm in height and 109.00 mm in length, it keeps the rifle streamlined while preserving the adjustability expected from a modern AR stock.

About UTG

UTG is a brand of Leapers, Inc., a company founded in Michigan in 1992 and headquartered in Livonia, Michigan, United States. Leapers develops optics and accessories for hunting and shooting sports, with a catalog that spans riflescopes, mounts, rings, bipods, and firearm components. Its first product was a compact 4×28 scope, and the company has continued to expand from optics into a wider range of shooting equipment.

For this category, one of the key milestones was the launch of the UTG PRO line in 2009, which introduced U.S.-made products aimed at shooters who wanted domestic manufacturing in parts and accessories. That background is especially relevant to AR components such as stocks, handguards, and mounting hardware, where fit, tolerance control, and durability are central to performance. Leapers has built its reputation around practical shooting equipment with broad platform compatibility and a strong focus on sporting and tactical-style rifle applications.

Main Features

• Manufacturer: UTG
• Series: UTG Accessories
• Made in: USA
• Compatible with: Rifles
• Material: Polymer
• Weight: 204.00 g
• Height: 121.00 mm
• Length: 109.00 mm

Warranty

10 years. This product is covered by a ten-year warranty period.

In the Box

• UTG Pro AR15 Ops Ready S4 Mil-spec Stock
• Mil-spec extension tube
• Buffer
• Buffer spring
• Receiver end plate
• Castle nut
• 5.51 in extended cheek rest insert