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Lower Receiver Parts

A variety of lower receiver parts are available on AT3. From complete kits to individual pieces, we have the parts you need.
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6 reviews
$91.99 $108.99

Elevate the performance of your build with the AT3 Enhanced NP3™ Lower Parts Kit.  This premium AR-15 lower parts kit provides significant upgrades to some of the most critical parts - the trigger, pistol grip, and trigger guard. The Enhanced NP3™ trigger assembly removes grittiness and provides a cleaner "break", while the X-Tech ATG™ adjustable grip allows a configurable grip angle to suit your shooting...

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No reviews
$58.99 $69.99

Exceptional value for your next AR build - the AT3 Mil-Spec Plus Lower Parts Kit. The kit contains quality, mil-spec parts to build out your lower receiver. It includes a standard A2 pistol grip, as well as an enhanced trigger guard that provides extra room in the trigger area. American Made Quality All parts meet or exceed military specifications (Mil Spec) Components...

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7 reviews
$74.99

Color coded bags and an easy-to-use parts list will save you time and frustration with this excellent Lower Parts Kit (LPK) for AR-15.   It includes a pistol grip, fire controls and pins necessary to complete stripped lower - everything but the stock and the lower receiver. All parts are Mil-spec and well packaged. The kit includes: Bolt catchBolt catch plungerBolt...

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1 review
$39.85

Developed from the operational experience of the Magpul Dynamics team, the B.A.D. Lever (Battery Assist Device) is designed to considerably improve the speed and efficiency of the AR15/M16 bolt catch. The B.A.D. Lever quickly addresses reloading and malfunction clearance shortcomings of AR15/M16 platforms by extending a paddle to the right side of the weapon, allowing manipulation of the bolt stop...

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No reviews
$49.99

The CMMG Gun builders kit includes most of the necessary parts to build up your lower group while excluding the commonly upgraded parts. Does not include Trigger Guard, Fire Control Group, and pistol grip. This kit offers an economical way to get all the small pieces needed for an AR-15 lower, without wasting money on the parts you won't use. CMMG...

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No reviews
$21.99

These new pins feature a divot and slightly longer length to aid in removal.

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2 reviews
$62.85

Ambidextrous selector with no screws or threading to come loose or strip; utilizes stainless steel detent plungers to lock levers into place. The traditional lever side has been built for a more positive feel. The right side features a lower profile lever and will not interfere with trigger operation for right handed shooters. Rugged machined billet tool steel construction. -...

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No reviews
$38.85

Easily release bolt with either left or right hand. Streamlines firearm clearing and reloads after a malfunction. Improved control without hand changeovers. Made in the U.S.A.

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1 review
$72.45

Ambidextrous Magazine Release replicates the feel and length of a standard magazine release button to accommodate left-handed shooters. Ambidextrous selector with no screws or threading to come loose or strip; utilizes stainless steel detent plungers to lock levers into place. The traditional lever side has been built for a more positive feel. The right side features a lower profile lever...

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No reviews
$58.49

The CMMG Mk3 .308 GunBuilders kit includes most of the necessary parts to build up your lower group except the commonly upgraded parts. Does not include Fire Control Group, and pistol grip. Compatible with CMMG Mk3 Lowers and most LR308 type lowers. All parts meet or excede mil-spec.

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No reviews
$79.99 $85.95

All the internal parts you need to for a stripped LR308 pattern lower receiver. Kit includes: Fire-control group: trigger, trigger spring, disconnector Weighted hammer for use with .308 ammo. .153” diameter hammer/trigger retaining pins hammer spring, bolt stop bolt catch bolt stop screw selector selector detent magazine release button magazine catch front pivot pin rear takedown pin buffer retainers all...

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$20.49

AR Take Down Detent, 10 packMade in The USA

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$29.99

This quick upgrade replaces your standard safety selector to accommodate left and right handed shooters. All parts meet or excede mil-spec.

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$10.99 $11.99

LBE Unlimited AR Bolt Catch Assembly, Black Finish

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$96.99 $99.95

All the parts you need to get started on you next .308 build - also includes a CMMG Ambi Selector. Combine this kit with a buttstock kit to complete your lower group. Compatible with CMMG Mk3 Lowers and most LR308 type lowers. All parts meet or excede mil-spec.

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No reviews
$86.49

All the parts you need to get started on you next Mk3 build. Combine this kit with a buttstock kit to complete your lower group. Compatible with CMMG Mk3 Lowers and most LR308 type lowers. All parts meet or excede mil-spec. The CMMG Lower Parts Kit for the MK3 contains 4 color-coded bags: The Clear bag contains the .308 takedown...

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No reviews
$71.85

The LRPK1 is a lower receiver kit from DPMS that includes everything needed to build a complete lower receiver , except for the stripped lower receiver. For standard military spec parts and dependable quality, go for the DPMS LRPK1.   FEATURES: Complete lower receiver kit; All of the parts you need to build it 100% Milspec parts   SPECIFICATIONS: Package...

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$22.99

AR15 Buffer Retaining Pin, 10 pack Made in the USA

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$26.99

These .308 mproved pins are slightly longer to make take down much faster and easier. The ends have a divot to allow the use of a bullet tip without the fear of slipping. Used on Mk3 platform or LR308 patterned .308 rifles.

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$20.49

AR15 Buffer Retaining Pin Spring, 10 packMade In the USA

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No reviews
$20.49

AR Take Down Detent Spring, 10 pack Made in The USA

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4 reviews
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This quality lower parts kit excludes the two most commonly upgraded components - the grip and the trigger assembly (fire control group). This is the perfect kit for premium builds that include premium upgraded triggers like a Geissele. The kit contains quality, mil-spec parts and includes the selector as well as an enhanced trigger guard that provides extra room in the trigger...

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Knight's Armament Ambi-Mag Release Assembly will make magazine changes easy whether you are left-handed or right-handed. Zero mods to the weapon and includes the wrench to install it. FEATURES: Ambidextrous Magazine Release. Left-handed or right-handed, you'll be covered Easily installed - you don't have to be a gunsmith Fits standard, mil-spec AR-15 lower receiver Zero modifications to the weapon Installation wrench...

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The Knight's Armament Ambi-Safety Selector Kit is compatible with the AR-15 and SR-25 platforms. Choose from 3 different right hand selector options and go semi auto when you want. FEATURES: Ambidextrous. Left-handed or right-handed, you are covered Includes 3 different right hand selector options. Choose from a full size right hand selector lever, a semi-scalloped right hand selector that is...

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The BP01 or the DPMS Field Repair Kit includes some of the most essential parts that you might need out on the field. Don’t get caught unprepared, get the BP01. FEATURES: Essential parts Field Repair Kit. Will cover the most common AR-15 repairs SPECIFICATIONS: 10 piece repair kit Kit Includes: LR-22 Trigger Spring BT-07 Extractor BT-08 Extractor Spring Assembly LR-31...