Lower Parts
Looking to get new parts for your AR's lower receiver. This is the place to look, with hundreds of parts from stocks and grips to a new mag release button. Shop with Grid Defense to customize and build the best lower receiver you can. Make your firearm look, feel, and perform the best with our selection of OE and aftermarket parts.
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Out of stock
SKELETONIZED ELITE TRIGGER GUARD - ZOMBIE GREEN
$25.99PREMIUM SKELETONIZED ELITE TRIGGER GUARD - ZOMBIE GREEN This Skeletonized trigger guard is the premium option from the Vital trigger guard that comes standard with all completed lowers. With it's...$25.99 -
Out of stock
Strike Industries Advanced Receiver Extension - Blue
$52.95Strike Industries Advanced Receiver Extension - Blue The Strike Industries Advanced Receiver extension brings an updated aesthetic and increased functionality to an often neglected, yet highly...$52.95 -
STRIKE INDUSTRIES FANG BILLET TRIGGER GUARD - BLUE
$21.95STRIKE INDUSTRIES FANG BILLET TRIGGER GUARD - BLUE Contents:- 1x Aluminum Trigger Guard- 4x M3 Hex Screw- 1x Warning card Features:- Aircraft grade aluminum construction- Magazine reload...$21.95 -
On Sale
Sylvan Arms AR15 QD Backplate
Sale: $26.99MSRP: $29.99Sylvan Arms AR15 QD Backplate Machined from billet 7075 Aluminum Replacement for Standard AR-15 End Plate Three QD Sling Swivel Sockets Ambidextrous Attachment Points BlackSale: $26.99MSRP: $29.99 -
TIMBER CREEK RECEIVER EXTENSION PLATE - FLAT DARK EARTH
$69.99TIMBER CREEK RECEIVER EXTENSION PLATE - FLAT DARK EARTH Drop in replacement Fits any milspec buffer tube Lightweight Made in the USA$69.99 -
Out of stock
2A Armaments Builder Series Solid Trigger Guard
$14.992A Armaments Builder Series Solid Trigger Guard Precise Manufacturing Long Term Reliability Durable Construction Black Anodized Finish For Ar-15 Rifles$14.99 -
Out of stock
Battle Arms Development Enhanced .308 Bolt Catch
$17.00Battle Arms Development Enhanced .308 Bolt Catch Weight 0.53oz Compatible with Norgon Ambi-Catch Without Interference Raised "T-Shaped" Heel Provides Positive and Distinctive Control Surface for...$17.00 -
Elftmann Tactical Adjustable Trigger - Straight
$139.00Elftmann Tactical Adjustable Trigger - Straight Fits any and all AR platforms Incremental Adjustment Knob Drop-Safe Adjustable from 2 3/4lbs to 4lbs without removing from lower$139.00 -
Geissele Automatics Maritime Bolt Catch
$29.00Geissele Automatics Maritime Bolt Catch Increased Surface Area Aggressive Checkering Extended Controls$29.00 -
Geissele Super Semi-Automatic Trigger
$250.00Geissele Super Semi-Automatic Trigger Features Type:Â 2 Stage 1st Stage Weight:Â 2.5lbs 2nd Stage Weight:Â 2.0lbs T$250.00 -
Grid Defense Complete AR-15 Rifle Parts Kit - FDE
$124.99Grid Defense Complete Rifle Parts Kit - FDE Lower Parts Kit FDE Cerakote Trigger Group FDE Cerakote A2 Grip Buffer Retainer Pin Buffer Retainer Spring Trigger Guard Safety...$124.99 -
Magpul UBR Gen 2 Adjustable Stock - Black
$199.95Magpul UBR Gen 2 Adjustable Stock Compatible with Milspec Carbine as well as A5 and SR-25 Length Buffer Systems AR15/M4 Butt Stock Lightweight and Durable Front and Rear QD Sling Attachment...$199.95 -
Out of stock
Maxim Defense CCS Gen 6 Stock - Black
$295.00Maxim Defense CCS Gen 6 Stock - Black Uses Standard Buffer 3 Postition Fits AR-15$295.00 -
Out of stock
PHASE5 HEX-2 AR15 PISTOL BUFFER TUBE - GRAY
$59.95PHASE5 HEX-2 AR15 PISTOL BUFFER TUBE - GRAYÂ Model: Hex-2Product Type: Buffer TubeFinish/Color: GrayFit: AR-15 PistolAccessories: Includes Castle Nut, End Plate, Foam PadDescription: Specifically...$59.95 -
PHASE5 OVERSIZED MAGAZINE RELEASE GRAY
$19.99OVERSIZED PHASE 5 MAGAZINE RELEASE GRAY Features: Larger contact surface than a Mil-Spec Mag Release Button  Ergonomic pocket on surface of paddle for your finger  CNC machined from lightweight...$19.99 -
Out of stock
Radian Weapons AR15 Ambidextrous Talon Safety Selector 4-Lever Kit Tungsten Grey
$87.45AR15 Ambidextrous Talon Safety Selector 4-Lever Kit Tungsten Grey The Talon™ ambidextrous safety selector is a modular design that can be installed as a standard 90° or as a 45° short throw by...$87.45 -
Out of stock
Seekins Precision Builder's Kit Lower Parts Kit
$149.00Seekins Precision Builder's Kit Lower Parts Kit Seekins Precision Parts No Trigger Included Ar-15 LPK Trigger Guard Mag Release Bolt Catch$149.00Out of stock
SKELETON GRIP AND TRIGGER GUARD COMBO - BURNT BRONZE
$94.99Tactical Dynamics Skeleton Grip - Burnt Bronze Finished in Burnt Bronze Cerakote Machined from 7075-T6 Aluminum Durable and Lightweight Compatible with AR15/AR10 Platforms Unique Design Made...$94.99
Strike Industries AR Flip Switch - Black
$41.95Strike Industries AR Flip Switch - Black Package includes:- 2x Shaft Screw- 1x 60/90 Shaft- 1x End Cap- 1x Right Side Flip Switch- 1x Left Side Flip Switch Features- Ambidexterous- Ergonomic Shape-...$41.95
Strike Industries Modular Magazine Catch - Black
$35.95Strike Industries Modular Magazine Catch - Black Modular design for quick and simple magazine button replacement Textured for positive feel and manipulation Magazine buttons made from durable...$35.95