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Lower Parts Kit, Forged

Inventory: Out of Stock
Price: $155.00

While not strictly limited to Umbrella receivers, we put this kit together as a high quality option for customers looking to build-out their forged, mil-spec type AR-15 lowers without having to chase down individual components. This Umbrella kit includes all necessary parts to complete your forged lower receiver less the required stock assembly (receiver extension, end plate, extension nut, buffer, action spring, stock). In addition to the high quality individual pieces, this kit includes ALG/Geissele’s Quality Mil-Spec (QMS) hammer and trigger set, Battle Arms Development’s BAD-ASS ambidextrous selector, B5 Systems’ oversize swing down trigger guard, and Umbrella’s own Grip 23. For those not familiar, Geissele's QMS trigger is a fantastic but economical upgrade to the standard mil-spec AR-15 trigger. The pull is similar to the stock trigger but much smoother with a clean break right around 6 pounds. Even so, this trigger meets specifications for the M4 carbine and as such complies with duty regulations requiring mil-spec parts. And the Battle Arms Development ambidextrous 90° selector represents the best ambi upgrade for the platform. B5 Systems' aluminum trigger guard provides an oversized profile vs that of the straight mil-spec guard. With this design, B5 decided to maintain the fold-down capability of the original but this leaves the familiar gap between grip and trigger guard. For those bothered by this space, an aftermarket filler is advised. Parts kit includes the following components:

  • Pivot Pin
  • Pivot Pin Detent, stainless steel
  • Pivot Pin Spring, 17-7 PH stainless steel
  • Takedown Pin
  • Takedown Pin Detent, stainless steel
  • Takedown Pin Spring, 17-7 PH stainless steel
  • Bolt Catch, S7 shock resistant tool steel
  • Bolt Catch Roll Pin
  • Bolt Catch Plunger
  • Bolt Catch Spring, 17-7 PH stainless steel
  • Magazine Button
  • Magazine Catch
  • Magazine Catch Spring, 17-7 PH stainless steel
  • Buffer Retaining Detent
  • Buffer Detent Spring, 17-7 PH stainless steel
  • Selector Detent, stainless steel
  • Selector Spring, 17-7 PH stainless steel
  • Battle Arms BAD-ASS Ambi Selector (90° throw w/long & short standard levers)
  • Hammer Spring
  • Trigger Spring
  • Disconnector Spring
  • Hammer Pin, 4140 chromoly steel alloy
  • Trigger Pin, 4140 chromoly steel alloy
  • ALG Defense QMS Hammer, mil-spec 8620 alloy casting
  • ALG Defense QMS Trigger, mil-spec 8620 alloy casting
  • ALG Defense QMS Disconnector, 1070 high carbon steel
  • Trigger Guard Roll Pin, 1070 high carbon steel
  • B5 Systems 6061-T6 Aluminum Oversized Trigger Guard
  • Umbrella Grip 23
  • All components, material, and packaging made in the USA

As with all Umbrella products, these kits are made to the finest standards and carry an unconditional guarantee against material defect and manufacturing failure. Assembly by a qualified Armorer is required.

Note: If you own, or have ordered an Umbrella billet lower, this is not the kit for that receiver. The Umbrella billets include a number of parts already, some of which are again included in this kit. To complete your Umbrella billet lower, look for our "Billet" parts kit.