Leapers Inc. UTG Pro Model 4 S2 Mil-Spec Stock Kit - Black

The Leapers Inc. UTG Pro Model 4 S2 mil-spec stock kit gives your AR-pattern rifle a lightweight, ergonomic upgrade with the fit and function shooters demand. This complete stock kit includes everything you need—polymer stock, mil-spec extension tube, buffer, buffer spring, tear-drop ring, and castle nut—making installation straightforward whether you're building a new rifle or refreshing a current setup.

Built in the USA with precision engineering and tight tolerances, the UTG Pro Model 4 S2 combines impact-resistant polymer construction with a machined aluminum extension tube that's anodized for durability in the field. The stock features an integrated rubberized butt pad and slanted cheek rest designed to improve shooting stability and help you maintain consistent control shot after shot. Its slim profile and extended 7.5" length increase your length of pull, while fully dehorned corners and melted contours eliminate snag points and add comfort during handling and carry.

Versatility is built in: ambidextrous sling loop and QD sling swivel housing work equally well for left- or right-handed shooters, and the design pairs cleanly with UTG's super slim handguards for a balanced, efficient platform. Whether you're running a duty rifle, competition gun, or hunting build, this mil-spec stock kit delivers the reliability and ergonomics serious shooters expect without compromise.

Key Features

• Complete stock kit—includes polymer stock, mil-spec extension tube, buffer, buffer spring, tear-drop ring, and castle nut
• USA-designed and manufactured with precision machined components
• Impact-resistant polymer stock paired with aircraft-grade aluminum extension tube
• Anodized extension tube resists corrosion and wear
• Rubberized butt pad and slanted cheek rest enhance stability and control
• Slim profile with 7.5" extended length for increased length of pull
• Ambidextrous sling loop and QD sling swivel housing for both-handed use
• Fully dehorned corners and melted contours for snag-free performance and comfort

Specifications

Frequently Asked Questions

Is this a complete stock kit, or do I need to buy parts separately?

This is a complete kit. It includes the polymer stock, mil-spec extension tube, buffer, buffer spring, tear-drop ring, and castle nut—everything required for installation on a standard mil-spec AR-pattern lower receiver.

What's the difference between this stock and a standard mil-spec stock?

The UTG Pro Model 4 S2 emphasizes ergonomics and comfort: it features a rubberized butt pad, slanted cheek rest for shooting stability, a slim profile, and fully dehorned corners to eliminate snags. The aluminum extension tube is precision machined and anodized for corrosion resistance, and the design pairs well with slim handguards for a balanced platform.

Can left-handed shooters use this stock?

Yes. The stock includes ambidextrous sling loop and QD sling swivel housing, making it functional and accessible for both left- and right-handed shooters.

What's the length of pull on this stock?

The extended stock length is 7.5", providing increased length of pull for a wider range of shooter sizes and clothing configurations.