UTG PRO MODEL4 S1 STK KIT ML-SPC BLK
$50.65
Upgrade your AR-15 platform with the UTG PRO MODEL4 S1 Stock Kit, designed for maximum versatility with its 6-position Mil-Spec stock assembly. This comprehensive kit includes an extension tube, buffer, buffer spring, tear-drop ring, and castle nut, all finished in sleek black for a tactical look. Enhance your shooting experience with reliable performance and adjustability tailored for serious shooters.
14 in stock
Leapers, Inc. – UTG Model 4 Combat Ops S1, Stock Kit, 6-Position Mil-Spec Stock Assembly, includes Extension Tube, Buffer, Buffer Spring, Tear-drop Ring and Castle Nut, Black Finish RBUS1BM
| Weight | 1.813 lbs |
|---|---|
| Dimensions | 10.250 × 5.750 × 2.500 in |
| Manufacturer | Leapers, Inc. – UTG |
PROCESSING & SHIPPING
Orders typically ship within 1–3 business days (Monday–Friday) after payment and all required documentation are received. Time to arrival after shipment depends on the carrier. Shipping method is at BT Gun Company’s discretion; ammunition and oversized accessories are charged at actual shipping cost. We do not ship to Hawaii or Alaska.
FIREARM TRANSFERS
- Firearms must ship to a licensed FFL dealer of your choosing — confirm with them first that they can accept the transfer.
- Your receiving FFL will need to email their license to [email protected] before we can ship.
- Inspect your firearm at your FFL’s location before signing ATF Form 4473 — once signed, the firearm is considered accepted.
You’re responsible for knowing the firearms laws in your state before ordering. For complete shipping, returns, and restocking-fee policy details, see our Shipping & Returns page.

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