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Dirty Bird AR-15 Mil-Spec Lower Build Kit

Dirty Bird AR-15 Mil-Spec Lower Build Kit

Dirty Bird · Lower Receiver

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Best price

$134.95at AR15Discounts

checked Oct 31, 2026

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Where to buy

StorePriceAvailabilityBuyAdd to build
AR15Discounts Best price $134.95checked Oct 31, 2026 Check store Buy at AR15Discounts
Dirty Bird $149.95checked Oct 31, 2026 Check store Buy at Dirty Bird

Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.

Price history

Dashed line = out of stock. Tracking since Oct 28, 2026.

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StoreLatestLowestHighest
AR15Discounts$134.95$134.95$134.95
Dirty Bird$149.95$149.95$149.95

Since Oct 28, 2026.

About this part

The Dirty Bird AR-15 Mil-Spec Lower Build Kit is an AR-15 lower receiver from Dirty Bird. It's sold by 2 stores, from $134.95 to $149.95.

Specifications

Manufacturer
Dirty Bird
Platform
AR-15

From the manufacturer

The LE-Style Lower Build Kit includes everything you need to finish your lower receive. Mil-Spec LE Stock - 6 Position USGI / M4 Style The L-E stock was designed to conform with design parameters for the standard LE style stock found on most Law Enforcement and stock builds. This stock will fit with a Mil-Spec buffer tube and features a quick adjust grip lever and a multiple sling mounts. LENGTH (IN) 7.7 RECEIVER EXTENSION TYPE Mil-Spec WEIGHT (OZ) 11.5 LENGTH OF PULL RANGE (IN) 3.3 LENGTH OF PULL COLLAPSED (IN) 12.6 LENGTH OF PULL EXTENDED (IN) 15.9 MATERIAL High Strength Steel, Reinforced Polymer COLOR Black Dirty Bird Industries Single Stage Nickel Teflon Trigger Group Mil-spec trigger groups are reliable, easy to service and inexpensive. The problem is, mil-spec triggers tend to have a heavy trigger pull (sometimes up to 8 or 9 pounds) and the gritty take-up makes it difficult to tell where the break will be. This is where the Dirty Bird Single Stage Nickel Teflon Trigger Group comes in. Featuring honed and polished engagement surfaces, a slick and durable Nickel Teflon finish and finely tuned spring rate for the trigger and hammer springs, you get a smooth trigger pull with very little take-up and a crisp clean break at 5 - 5.5 pounds. Dirty Bird AR-15 True Mil-Spec Carbine Receiver Extension / Buffer Kit 100% American Made Kit 7075-T6 Aluminum 6-Position Mil-Spec Receiver Extension (7075-T6 Aluminum is nearly twice as strong as 6061) 3oz Carbine Recoil Buffer w/ Steel Counter Weights Hardened Castle Nut w/ Staking Cuts Mil-Spec End Plate 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 A2 Style Pistol Grip Assembly

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$134.95 at AR15Discounts
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