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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Geissele Super Semi-Automatic Trigger
$240.00Geissele Super Semi-Automatic Trigger Features Type: 2 Stage 1st Stage Weight: 2.5lbs 2nd Stage Weight: 2.0lbs Total Pull Weight: 4.5lbs Adjustable: No Size: Mil-Spec Trigger Bow Type: M4 Curved Weapon...$240.00 -
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 Selector Bolt Catch...$124.99 -
On Sale
Grid Defense Lower Receiver Spring Replacement Kit
Sale: $10.95MSRP: $13.95Grid Defense Lower Receiver Spring Replacement Kit Take Down Pin Detent Springs (2) Buffer Retainer Spring Hammer Spring trigger Spring Disconnect Spring Bolt Catch Spring Magazine Catch Spring Selector Detent SpringSale: $10.95MSRP: $13.95 -
On Sale
Grid Defense Mil-Spec Lower Parts Kit - FDE
Sale: $59.99MSRP: $79.99Ghost Firearms Mil-Spec Lower Parts Kit - FDE FDE Cerakote Trigger Group FDE Cerakote A2 Grip Buffer Retainer Pin Buffer Retainer Spring Trigger Guard Safety Selector Bolt Catch Spring Detent Spring Bolt...Sale: $59.99MSRP: $79.99 -
Grid Defense Pistol Stabilizing Fin - Smith & Wesson Red
$49.99Grid Defense Pistol Stabilizing Fin - Smith & Wesson Red -Constructed from Reinforced Polymer -Increases Weapon Control and Stability -Weighs 5.7oz -Fits Pistol Buffer Tube up to 1.25" (Not Included) -Finished in Smith & Wesson Red Cerakote$49.99 -
Magpul CTR Mil-Spec Stock - Gray
$64.95Magpul CTR Mil-Spec Stock - Gray Mounts on milspec-sized receiver extension tube Shielded release latch Removable butt-pad Sling mounts$64.95 -
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 Points Two Footman's Loops Ergonomic MOE SL Angled-Toe...$199.95 -
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 -
Odin Works ZULU Stock Kit - Blue
$149.00Odin Works ZULU Stock Kit - Blue Made from 6061 aluminum and Limbsaver recoil pad Secondary Buffer System Reduces Recoil Weight: 1.23 lbs Kit includes: -ZULU Adjustable Stock -Padded Intermediate Buffer Tube -Ambi Sling/QD Plate Length of pull:...$149.00 -
Out of stock
PHASE5 HEX-2 AR15 PISTOL BUFFER TUBE - GRAY
$59.95PHASE5 HEX-2 AR15 PISTOL BUFFER TUBE - GRAY Model: Hex-2Product Type: Buffer TubeFinish/Color: GrayFit: AR-15 PistolAccessories: Includes Castle Nut, End Plate, Foam PadDescription: Specifically designed to fit SIG SB15 Stabilizing Brace$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 6061-T6 billet aluminum for...$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 simply rotating the shaft 180° inside the...$87.45 -
Rise Armament RAVE-PCC Trigger
$159.99Rise Armament RAVE-PCC Trigger Black Nitride Finish Includes Anti-Walk Pins Durable Construction 3.5 lb trigger pull Designed for use in 9MM AR configurations$159.99 -
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 Ambi Safety Take Down Pins Pins Detents and Springs$149.00 -
Out 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 in the USA VITAL AR 15 TRIGGER GUARD - BURNT...$94.99 -
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 important component of the AR15/AR10 weapon system...$52.95 -
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- Modular Assembly- Strike 60/90 Option Note: Not...$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 and lightweight polymer The Strike Industries AR...$35.95 -
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 -
Sylvan Arms Folding Stock Adapter Gen 4 - Left Hand
$199.99Sylvan Arms Folding Stock Adapter Gen 4 - Left Hand Compatible with most AR15 Standard 1-3/16" x 16 thread Lightweight and Corrosion-Resistant Left folding$199.99