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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On Sale
Ghost Mil-Spec Lower Parts Kit
Sale: $49.99MSRP: $59.99Ghost Mil-Spec Lower Parts Kit Trigger Group A2 Grip Buffer Retainer Pin Buffer Retainer Spring Trigger Guard Safety Selector Bolt Catch Spring Detent Spring Bolt Catch Plunger Bolt Catch Magazine...Sale: $49.99MSRP: $59.99 -
On Sale
Complete Rifle Parts Kit - AR15
Sale: $75.99MSRP: $94.99Complete Rifle Parts Kit Lower Parts Kit Trigger Group A2 Grip Buffer Retainer Pin Buffer Retainer Spring Trigger Guard Safety Selector Bolt Catch Spring Detent Spring Bolt Catch Plunger Bolt...Sale: $75.99MSRP: $94.99 -
Grid Defense Mil-Spec Carbine Buffer Tube Assembly
$35.00Grid Defense Mil-Spec Carbine Buffer Tube Kit Made in the USA Compatible with M4 Type Butt Stocks 6 Position Carbine Buffer Tube Machined from 7075-T6 Aluminum End Plate Castle Nut Carbine Buffer Spring Carbine Buffer Weight: 9.75oz Hard Coat...$35.00 -
M4 Mil-Spec Stock
$18.00Six position M4 Stock for AR-15 / M4 Carbine Rifles is structurally reinforced, feels more like A2 Stock when fully extended. The sling swivel can be offset to either left or right. Fits mil-spec buffer tubes. Black. Made in USA.$18.00 -
OOPS KIT - REPLACEMENT PARTS
$9.99AR 15 Oops Kit includes: (1) Hammer spring (1) Trigger spring (2) Hammer/trigger pins (1) Disconnector spring (2) Takedown/pivot pin detents (2) Takedown/pivot pin springs (1) Safety spring (1) Safety detent (1) Magazine release...$9.99 -
Out of stock
Tactical Dynamics Skeleton Grip - Black
$79.00Tactical Dynamics AR15 Skeletonized Grip - Black AR 15 Skeleton Grip Finished in a black cerakote...$79.00 -
Trinity Force Alpha Stock
$19.99Trinity Force Alpha Stock Snag Free Design Mil-Spec AR stock with Multiple Sling Mounting Options Textured Rubber Butt Pad Durable and Lightweight$19.99 -
On Sale
Tactical Dynamics Skeleton Grip - Blue Titanium
Sale: $69.00MSRP: $79.00Tactical Dynamics Skeleton Grip - Blue Titanium Finished in Blue Titanium Cerakote Machined from 7075-T6 Aluminum Durable and Lightweight Compatible with AR15/AR10 Platforms Unique Design Made in the USASale: $69.00MSRP: $79.00 -
Out of stockOn Sale
Tactical Dynamics Skeleton Grip - FDE
Sale: $69.00MSRP: $79.00Tactical Dynamics Skeleton Grip - Flat Dark Earth Finished in Magpul FDE Cerakote Machined from 7075-T6 Aluminum Durable and Lightweight Compatible with AR15/AR10 Platforms Unique Design Made in the USASale: $69.00MSRP: $79.00 -
On Sale
Tactical Dynamics Skeleton Grip - Burnt Bronze
Sale: $69.00MSRP: $79.00Tactical 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 USASale: $69.00MSRP: $79.00 -
Out of stockOn Sale
Tactical Dynamics Skeleton Stock - Black
Sale: $56.00MSRP: $109.00Tactical Dynamics Skeletonized Stock Made in the USA Black Cerakote Finish Machined from 6061-T6 Aluminum Minimalist Stock Compatible with Milspec Carbine Buffer Tubes Specs 6 3/4" Long 5 1/4" Contact Area 1 1/4" Wide 9.65ozSale: $56.00MSRP: $109.00 -
On Sale
Tactical Dynamics Skeleton Grip - OD Green
Sale: $69.00MSRP: $79.00Tactical Dynamics Skeleton Grip - OD Green Finished in Magpul Olive Drab Green Machined from 7075-T6 Aluminum Durable and Lightweight AR Skeleton Pistol Grip. Compatible with AR15/AR10 Platforms Unique Design Made in the USASale: $69.00MSRP: $79.00 -
PISTOL GRIP SCREW - AR15
$2.99PISTOL GRIP SCREW - AR15 Compatible with AR15/M4/AR10 Lower Receivers American Made$2.99 -
Magazine Catch and Button
$7.99MAGAZINE CATCH WITH BUTTON - AR15/M16 Magazine Catch Magazine Release Button Compatible with AR15/M4 Lower Receivers American Made$7.99 -
Out of stock
Grid Defense Nickel Boron Fire Control Group
$39.00Grid Defense Nickel Boron Fire Control Group Nickel Boron Disconnect Nickel Boron Trigger Nickel Boron Hammer Compatible with AR15/AR10$39.00 -
Out of stock
Tactical Dynamics Skeleton Grip - Tactical Grape
$79.00Tactical Dynamics Skeleton Grip - Tactical Grape Finished in Purple Cerakote Machined from 7075-T6 Aluminum Durable and Lightweight Compatible with AR15/AR10 Platforms Unique Design Made in the USA$79.00 -
Out of stock
Sylvan Arms Folding Hinge Stock Adapter - Gen 3
$179.99The Sylvan Arms Folding Hinge Stock Adapter allows you to fold your stock and significantly reduce the length of your rifle for easy stow and travel.Specifically designed for gas piston and direct impingement systems 5.56 to .308 systems, as well as .223...$179.99 -
On Sale
Tactical Dynamics Skeleton Stock - Tungsten Gray
Sale: $56.00MSRP: $109.00Tactical Dynamics Skeleton Stock Finished in Tungsten Gray Cerakote Made in the USA Compatible with Milspec Carbine Buffer Tube Machined from 6061-T6 Aluminum Specs 6 3/4" Long 5 1/4" Contact Area 1 1/4" Wide 9.65ozSale: $56.00MSRP: $109.00 -
Out of stock
TACTICAL DYNAMICS SKELETON GRIP - ZOMBIE GREEN
$79.00TACTICAL DYNAMICS SKELETON GRIP - ZOMBIE GREEN Finished In Zombie Green Machined from 7075-T6 Aluminum Durable and Lightweight Compatible with AR15/AR10 Platforms Unique Design Made in the USA$79.00 -
$6.99