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The Magpul UBR (Utility / Battle Rifle), U.S. Patent 6651371, is a fully-featured, adjustable butt stock 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 Receiver Extension tube (included) to accomodate the common M4 carbine buffer and spring
7-Position LOP adjustability with customizable preset system for fast access to preferred length
Multi-shell construction provides solid foundation and shields critical operating parts from penetration damage
Solid "fixed stock" lockup in all positions
Enhanced lock mechanism w/ integral impact buffer increases drop strength and shock resistance
Repositionable cheek piece accommodates users requiring extra eye-relief
Stout construction provides counterbalance weight for improved weapon balance and handling
Front / Rear - Single-side push-button QD sling mount sockets (Left-Right Reversible)
Bottom - 1.25" Sling loop
Storage Module (Left-Right Reversible / Removable)
Rubber Butt-Pad, 0.30" (Removable)
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 Sling Mount Sockets
UBR Collapsible Butt Stock (w/ Rubber Butt-Pad, 0.30")
Weight, Stock: 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