UTG PRO S1 Mil-Spec AR-15 Buttstock Kit – All Parts Included – Buffer, Tube, Springs, & More

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UTG Pro S1 AR-15 Stock Kit – Complete Mil-Spec 6-Position Recoil System

Features

Complete AR-15 carbine stock kit with stock, receiver extension, buffer, spring, end plate, and castle nut
Six-position mil-spec receiver extension provides adjustable length of pull
S1 polymer stock features a rubberized butt pad and slanted cheek rest
Dual waterproof storage compartments accommodate up to eight CR123 batteries or other small accessories
Integral ambidextrous sling loop and QD sling swivel housing provide multiple sling attachment options
Chamfered edges and rounded contours help reduce snag points
Available in Black and Flat Dark Earth
Designed and made in the USA

The UTG Pro S1 Stock Kit includes the components needed to add a complete carbine-length recoil system and adjustable stock to an AR-15 lower receiver. The full-size S1 stock provides a broad cheek rest, rubberized butt pad, and dual waterproof storage tubes, while the six-position mil-spec receiver extension allows the length of pull to be adjusted from 11.3″ to 14.6″. Black and FDE versions use the same components, with the FDE kit featuring a matching FDE Cerakote receiver extension.

Note: This kit includes an AR-15 carbine buffer and spring. It is not a complete AR-308 recoil system.

Specifications

Brand: UTG Pro
Model: Ops Ready S1 Mil-Spec Stock Kit
Compatibility: AR-15
Stock Positions: 6
Receiver Extension: Mil-spec diameter, 6061-T6 aluminum
Stock Material: High-strength polymer
Buffer: Standard carbine, 3.0 oz
Storage: Dual waterproof compartments, up to 8 CR123 batteries total
Stock Dimensions: 8.1″ long x 2.2″ wide x 5.5″ high
Length of Pull: 11.3″ collapsed to 14.6″ extended
LOP Adjustment Increment: 0.625″
Kit Weight: 23.1 oz
Castle Nut Torque: 35-40 ft-lb
Color, Finish & MPN:
- Black: RBUS1BM – Black anodized receiver extension
- Flat Dark Earth: RBUS1DM – FDE Cerakote receiver extension
Country of Origin: USA

What’s Included

1x UTG Pro S1 stock
1x Mil-spec 6-position receiver extension
1x Standard 3.0 oz carbine buffer
1x Carbine buffer spring
1x Tear-drop receiver end plate
1x Castle nut

Products available on this page:

UTG PRO S1 Mil-Spec AR-15 Buttstock Kit - All Parts Included - Buffer, Tube, Springs, & More - Black - Color: Black | SKU: RBUS1BM | UPC: 4717385550896

The AT3 Tactical store has a 90 day no-hassle return policy for products in good condition. You can view the full details of our return policy here.

If you encounter an issue or defect with a product after 90 days of your purchase, you can refer to the manufacturer for a warranty claim. Their policies are below.

UTG Lifetime Warranty

Leapers, Inc. warrants that all UTG & UTG PRO products conform to published specifications and are free from defects in material and workmanship. We will repair or replace defective products for the duration of the product’s life span. Our dedicated in-house customer service professionals will provide the best-in-class UTG experience.

Please note that this warranty does not extend to products disassembled, damaged from misuse, accidental impact, negligence, natural disasters/accidents, or unauthorized repair or alteration.

Warranty Instructions

Go to Warranty Request under Customer Service on our website.
Fill out the necessary contact and product information to the best of your knowledge.
A purchase receipt is required for all warranty cases and needs to be attached at the end of the form.
Finalize the case by submitting the information to us.
You will hear from one of our customer service reps within 24-48 hours and we will provide you with additional information and instructions.
No return will be accepted without an RA#.
For any questions regarding the process, please feel free to call at (734)542-1500.