MAGPUL UBR® Collapsible Stock BLK

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.
MAGPUL UBR® Collapsible Stock BLK
Click To Enlarge
  • Item #: MAG330
  • Manufacturer: MAGPUL
  * Marked fields are required.
Price $265.00
Availability In-Stock
# Available 1