Purchase the Dirty Bird Magpul UBR 2-Stage Lower Build Kit here!
The Magpul UBR 2-Stage Lower Build Kit includes everything you need to finish your lower receiver, including the brand-new Dirty Bird 2-Stage Trigger Group.
Magpul UBR GEN 2 Adjustable Stock Mounts on a durable custom Receiver Extension tube (included) to accommodate carbine buffers and springs as well as aftermarket A5 buffer systems* Solid “fixed stock” lockup and consistent cheek weld in all positions 7 adjustments plus fully collapsed for 8 total positions Adjustment lever requires only gross motor movement to operate yet the entire stock remains streamlined and anti-snag Enhanced lock mechanism with dual locking pawls for maximum 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 Storage Compartment in tail of stock is removable and the door is reversible for user preference Rubber butt-pad offers an anti-slip surface and increases impact protection Rollover on the toe allows for easier shoulder transitions and 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 Bottom – 1.25″ sling loop (additional loop accessible when Storage Compartment is removed) Dirty Bird 2-Stage Trigger Group This trigger assembly takes advantage of a two stage fire control design that has been trusted in both competition and combat roles for decades. Springs are tuned to provide a smooth first stage pull of about 1.5lbs and a crisp second stage break at 3lb for a total pull weight of 4.5lbs (actual total pull weight may vary ± .5lb). The 4.5lb total weight gives the operator a greater level of safety and control in high stress environments but with a second stage pull weight of only 3lbs, the shooter can also squeeze off long range precision shots with ease.
Magpul MOE-K2+ Grip Replacement for AR15/M4 pistol-grip* One-piece reinforced polymer construction with wrap-around rubber overmolding More vertical grip angle than standard A2 grips Unique backstrap design for proper trigger finger placement Hard-polymer bottom edge to reduce equipment snags or grip damage Includes a basic grip cap, but accepts optional Storage Cores for customized gear stowage Dirty Bird AR-15 Lower Parts Kit Minus FCG & Pistol Grip 100% American Made Kit Includes extra takedown / pivot pin detent and detent spring Includes enhanced polymer trigger guard Mil-Spec AR-15 Carbine Buffer Spring
KAK AR15 Standard Carbine Buffer

Take a look at our other AR-15 Lower Build Kits here!

Offer Expires 02/13/2020