UTG Pro AR-15 Ops Ready S4 Mil-Spec Stock - 2 Colors
or 4 interest-free payments of $6.99 with
6 Magazines Per Order: Due to extreme volume, we are limiting sales of magazines to 6 per customer order. This applies to individual and bundled magazines. AT3 reserves the right to cancel any order over the 6 magazine limit.
- Free standard shipping on orders $139+ details
- 90-day no-hassle returns policy
- Backed by the UTG Lifetime Warranty! what it covers
Frequently bought together
From orders that included this itemProduct description
UTG Pro S4 Compact AR-15 Stock – 4-Position Mil-Spec Fit
Features
- Compact 4.28″ stock body for lightweight AR-15 configurations
- Fits standard mil-spec carbine receiver extensions
- Four-position adjustment with a 0.625″ length-of-pull increment
- Removable extended cheek rest provides additional support without requiring a larger stock body
- Angled rubberized butt pad helps maintain consistent shoulder placement
- Reversible QD sling swivel socket can be configured for left- or right-side use
- Integrated sling loop supports traditional sling attachment
- Impact-resistant polymer construction
- Available in Black and Flat Dark Earth
- Designed and made in the USA
The UTG Pro Ops Ready S4 combines a short, lightweight stock body with a removable extended cheek rest for shooters who want a compact setup without giving up cheek support. It fits standard mil-spec carbine receiver extensions and provides four usable adjustment positions, with an extended length of pull that remains suited to compact rifles or use with body armor.
Note: This listing includes the stock only. A mil-spec carbine receiver extension, buffer, buffer spring, castle nut, and end plate are not included.
Specifications
- Brand: UTG Pro
- Model: Ops Ready S4
- Compatibility: Mil-spec carbine receiver extensions
- Adjustment Positions: 4
- Material: Polymer
- Dimensions: 4.3″ long x 1.66″ wide x 4.80″ high
- Extended Cheek Rest Length: 5.51″
- Length of Pull: 10.2″ collapsed to 11.5″ extended with a mil-spec carbine receiver extension
- Length-of-Pull Adjustment Increment: 0.625″
- Weight: 5.7 oz
- Color and MPN:
- Black: RBUS4BMS
- Flat Dark Earth: RBUS4DMS
- Country of Origin: USA
What’s Included
- 1x UTG Pro Ops Ready S4 stock
- 1x Removable extended cheek rest insert
All 2 options on this page
Customer reviews 29
AT3 Tactical · Thank you for your positive review of our UTG Pro AR-15 Ops Ready S4 Mil-Spec Stock! We are glad to hear that you are satisfied with the quality and value of our product. We appreciate your support and hope to continue providing great products for your firearm needs. Thank you again for choosing our product.
AT3 Tactical · Thank you for your positive review! We're glad to hear that our UTG Pro AR-15 Ops Ready S4 Mil-Spec Stock was a great addition to your M&P 15-22. We strive to provide high-quality, lightweight options for our customers.
AT3 Tactical · Thank you for leaving a review for the UTG Pro AR-15 Ops Ready S4 Mil-Spec Stock! We are glad to hear that you are happy with your purchase and that it fits well with your color scheme. We strive to provide high-quality products and we are happy to see that it met your expectations.
AT3 Tactical · Thanks for leaving a review for our UTG Pro AR-15 Ops Ready S4 Mil-Spec Stock. We're glad to hear that you are satisfied with your purchase and that the stock met your expectations. We appreciate your support and hope you continue to enjoy using our product.
AT3 Tactical · Thank you for leaving a review for the UTG Pro AR-15 Ops Ready S4 Mil-Spec Stock. We're thrilled to hear that you're enjoying the product and that it has made a noticeable improvement for you. We appreciate your feedback and thank you for choosing our product.
AT3 Tactical · Thank you for your positive feedback on the UTG Pro AR-15 Ops Ready S4 Mil-Spec Stock! We are glad to hear that it fits well and compliments your custom SBR. Happy shooting!
Questions & Answers 2
Loading questions…
Warranty & returns
Backed by the UTG Lifetime Warranty!
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.
Disclaimer: Manufacturer’s warranty is subject to change without prior notice.
90-day no-hassle returns
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.

















