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
Odin Works Bolt Catch - Black
$20.00Odin Works Bolt Catch - Black Fits AR-15 platform rifles Black Anodized Finish$20.00 -
PHASE5 OVERSIZED MAGAZINE RELEASE BLUE
$21.99PHASE5 OVERSIZED MAGAZINE RELEASE BLUE Features:  Larger contact surface than a Mil-Spec magazine release button  Ergonomic pocket on surface of paddle for your finger  CNC machined from...$21.99 -
Rise Armament Patriot Trigger with Challenge Coin and Anti-Walk Pins - Red
$189.99Rise Armament Patriot Trigger with Challenge Coin and Anti-Walk Pins - Red Single-stage trigger system with a lightened trigger pull (3.5-lb. pull weight) Helps you shoot more accurately with...$189.99 -
Out of stock
SKELETONIZED ELITE TRIGGER GUARD - TACTICAL GRAPE
$25.99PREMIUM SKELETONIZED ELITE TRIGGER GUARD - TACTICAL GRAPE 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 -
On Sale
Strike Industries FSA Stock - Black
Sale: $185.95MSRP: $197.95Strike Industries FSA Stock - Black Patented first-in-market Picatinny dual folding adapter with intuitive unfolding system Folds left or right anytime without flipping or reconfiguring...Sale: $185.95MSRP: $197.95 -
Out of stock
STRIKE INDUSTRIES STRIKE SWITCH - RED
$76.95STRIKE INDUSTRIES STRIKE SWITCH - RED Package includes:- 2x Shaft Screw- 1x 60/90 Shaft- 1x End Cap- 1x Right Side Strike Switch- 1x Left Side Strike Switch Features- Ambidexterous- Ergonomic...$76.95 -
Out of stock
Tactical Dynamics Skeleton Stock - Periwinkle
$109.00Tactical Dynamics Skeleton Stock Finished in Periwinkle Cerakote Made in the USA Compatible with Milspec Carbine Buffer Tube Machined from 6061-T6 Aluminum Specs 6 3/4" Long 5 1/4"...$109.00 -
Out of stock
2A Armament AR-15 Takedown Pin Set - Titanium
$28.992A Armament AR-15 Takedown Pin Set - Titanium "Mil-Spec" .250 Size Pocketed Design Through Drilled for Weight Reduction 6AL-4V Titanium$28.99 -
Out of stock
AR Enhanced Ambidextrous Safety Selector - Blue
$23.99AR Enhanced Ambidextrous Safety Selector - Blue For Left or Right-Handed Shooters Replaces Existing Safety Lever Easy-To-Operate Safety Lever on Both Sides of The Receiver Does Not Interfere...$23.99 -
Out of stockOn Sale
AR-15 Lower Parts Kit - FDE
Sale: $50.99MSRP: $55.99AR-15 Lower Parts Kit - FDE Mil-Spec Lower Parts Kit Minus Grip and Screw Ambidextrous Safety Selector Finished in FDE Cerakote Enhanced Bolt Catch Finished in FDE Cerakote Trigger Finished in...Sale: $50.99MSRP: $55.99 -
AR15 AMBIDEXTROUS TALON SAFETY SELECTOR 4-LEVER KIT - BLACK
$84.95AR15 AMBIDEXTROUS TALON SAFETY SELECTOR 4-LEVER KIT - BLACK This Talon ambi safety selector is a modular design that can be installed as a standard 90° or as a 45° short throw. Selector levers...$84.95 -
ATI Outdoors TactLite Stock - Fits Mossberg/Winchester/Remington 12 Gauge
$73.99ATI Outdoors TactLite Stock - Fits Mossberg/Winchester/Remington 12 Gauge Fits Mossberg/Remington/Winchester 12ga & 20ga (proud fit) Is a direct replacement and evolution of the MRW4100...$73.99 -
Out of stock
Battle Arms Development AR-15 Aluminum Takedown Pins - Purple
$29.95Battle Arms Development AR-15 Aluminum Takedown Pins - Purple Low Profile Pin Heads - Low drag and never in the way. Lower profile than mil-spec pin heads Ambidextrous Safety Compatible Bullet...$29.95 -
On Sale
Battle Arms Development Enhanced AK Trigger - Black
Sale: $49.50MSRP: $55.00Battle Arms Development Enhanced AK Trigger - Black Distinctive trigger bow design Short, smooth, and positive reset Maximum compatibility with most standard production AK patterned...Sale: $49.50MSRP: $55.00 -
Bravo Company Gunfighter Mod 0 Adjustable Stock - FDE
$60.00Bravo Company BCMGUNFIGHTER Mod 0 Adjustable Stock - FDE The strongest light-weight polymer stock available for your mil-spec receiver 2 different types of ambidextrous sling mounting...$60.00 -
Out of stock
CAA COLLAPSIBLE BUTT STOCK - BLACK
$59.35CAA COLLAPSIBLE BUTT STOCK - BLACK Storage compartment for CR123 batteries. Side Picatinny rail – allows addition of Adjustable cheek-rest (#ACP), mag’ pouch (#MPS) or shell holder (#SSM)...$59.35 -
Out of stock
Elftmann Tactical 3 Gun Straight Trigger
$279.00Elftmann Tactical 3 Gun Straight Trigger Drop-safe regardless of pull-weight Adjustable from 4lbs to 2 3/4lbs without removing from lower Very short pull and reset$279.00 -
Out of stock
Ergo MSR Compact AR-15 Pistol Grip - Black
$17.99Ergo MSR Compact AR-15 Pistol Grip - Black MSR Upgraded Pistol Grip Aggressive Texturing Integral rear upper extension supports the web of the shooters hand Mounting hardware included$17.99 -
F-1 Firearms SSK Safety Selector Kit - Black
$64.99F-1 Firearms SSK Safety Selector Kit - Black 90 Degree Throw Anodized Finish Skeletonized Construction 1 Long and 1 Short Paddle Includes Tube, Detent, Spring and 2 Screws$64.99 -
Out of stock
Fortis Magazine Release Button AR15/AR10 - Black
$7.95Fortis Magazine Release Button AR15/AR10 - Black Description: The Fortis Billet Mag Button is a superior alternative to the ones found in a mil-spec lower parts kit. Easily installs in seconds and...$7.95