Magpul

-Mounts on a durable custom Receiver Extension tube (included) to accommodate the commonM4 carbine buffer & spring as well as aftermarket A5 buffer systems*-Solid "fixed stock" lockup & consistent cheek weld in all positions-9-Position LOP adjustability-Adjustment lever requires only gross motor movement to operate yet the entire stock remains streamlined & anti-snag-Enhanced lock mechanism with dual locking pawls for maximum drop strength & shock resistance-Multi-shell construction provides solid foundation & shields critical operating parts from penetrationdamage-Sloping cheek weld combines a slim profile with user comfort-Storage Compartment in tail of stock is removable & the door is reversible for user preference-Rubber butt-pad offers an anti-slip surface & increases impact protection-Rollover on the toe allows for easier shoulder transitions & better fit when using body armor-Sling Mounts -Front - QD swivel mount for ambidextrous one-point QD sling mounting -Left/Right Rear-Rotation-limited QD swivel sling mounts fit up to 1.5" push-button swivels included) -Bottom - 1.25" sling loop (additional loop accessible when Storage Compartment is removed)*The UBR GEN2 includes the required custom Receiver Extension tube, Buffer Spacer, & all mounting hardware. A carbine buffer and spring (M4 or SR25 length) or A5 buffer & spring are required for use with the UBR & are not included.**Specifications based on factory configuration