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Magpul UBR Utility Battle Rifle Stock w/ Buffer Tube for AR-15 - MAG330

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We have a 90-day no-hassle return policy. We pay return shipping.

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After 90 days, defective items will still be covered under the manufacturer’s warranty, where applicable.

Please refer to the product listing for warranty details. If you have specific warranty questions, contact us at We may direct you to pursue your warranty claim directly with the manufacturer.

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The Magpul UBR (Utility / Battle Rifle), U.S. Patent 6651371, is a fully-featured, adjustable buttstock for the AR15/M16. Unlike typical collapsing stocks, this modular design offers the stability of a fixed stock with consistent cheek weld in any position. Seven-position length-of-pull (LOP) adjustment is quickly executed with gross motor movement while the integral preset system allows direct access to a preferred position. A robust lock mechanism and multi-shell construction increase durability under severe impact conditions experienced during malfunction clearing and accommodates large-bore AR calibers with ease. The UBR also provides extra counterbalance weight to improve handling on full-length rifles and weapons with muzzle-heavy accessories or bull-barrels. Optional components such as dual-side sling mounts and metal strike plate allow the UBR to adapt to the mission at hand.

Made in U.S.A.


Mounts on durable Entry-Length Receiver Extension tube (included) to accommodate the common M4 carbine buffer and spring

7-Position LOP adjustability with customizable preset system for fast access to preferred length

Adjustment lever requires only gross motor movement to operate yet the entire stock remains streamlined and anti-snag

Solid "fixed stock" lockup and consistent cheek weld in all positions

Enhanced lock mechanism w/ internal impact buffer increases drop strength and shock resistance

Multi-shell construction provides solid foundation and shields critical operating parts from penetration damage

Sloping cheek weld combines a slim profile with user comfort

Stout construction provides counterbalance weight for improved weapon balance and handling

Storage compartment in tail of stock is removable and the door is reversible for user preference

Removable 0.30" Rubber Butt-Pad offers an anti-slip surface and increased impact protection

Sling Mounts

Front/Rear - Reversible QD swivel sling mounts fit up to 1.5" push-button swivels (swivel not included)

Bottom - 1.25" sling loop

Optional Accessories*

Extended Rubber Butt-Pad, 0.55"

Enhanced Rubber Butt-Pad, 0.70"

Aluminum Strike Plate w/ 1.25" sling loop

Dual-side push-button QD Swivel Sling Mounts


UBR Collapsible Butt Stock

Weight: 1.46 lb.

Weight, w/ Entry Receiver Extension: 1.63 lb.

Length, Stock: 8.00-11.36 in.

LOP Adjustment: 7-Position (0.56 in. / position)

LOP Adjustment Range: 3.36 in.

LOP, Collapsed (M4/M16): 11.10 in.

LOP, Extended (M4/M16): 14.46 in.

NOTE: The UBR includes the necessary Entry-Length Receiver Extension tube and all mounting hardware. An M4 carbine buffer and spring are required for use with the UBR and are not included.

7.62x51 ARs may require the use of a custom short buffer and spring.

*Standard Rubber Butt-Pad, 0.30" weight: 0.08 lb. Optional Extended Rubber Butt-Pad, 0.55" weight: 0.11 lb. Optional Enhanced Butt-Pad, 0.70" weight: 0.13 lb.

**Specifications based on factory configuration

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