Magpul UBR 2-Stage Lower Build Kit

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From $350.79

KAK AR-15 Standard Carbine Buffer
1 × KAK AR-15 Standard Carbine Buffer

In stock

$15.00
NBS Mil-Spec AR-15 Carbine Buffer Spring
1 × NBS Mil-Spec AR-15 Carbine Buffer Spring

In stock

Original price was: $3.95.Current price is: $0.99.
Magpul UBR GEN 2 Adjustable Stock
1 × Magpul UBR GEN 2 Adjustable Stock
Color
Clear

Out of stock

$199.95
Magpul MOE-K2+ Grip
1 × Magpul MOE-K2+ Grip
Color
Clear

Out of stock

$24.95
Dirty Bird 2-Stage Trigger Group
1 × Dirty Bird 2-Stage Trigger Group
Trigger
Clear

Out of stock

(10 %)
MSRP: $99.95 – $149.95
From $89.95
AR-15 Lower Parts Kit
1 × Dirty Bird AR-15 Lower Parts Kit Minus FCG & Pistol Grip

In stock

(33 %)
MSRP: $29.95
Original price was: $29.95.Current price is: $19.95.

In stock

Estimated delivery excludes weekends and holidays; subject to weather and compliance exceptions. FFL orders ship to dealers; ETA reflects shipment date, not transfer.
SKU: BUNDLE-UBR Category:
Description

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 of 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