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
AR-15 Mil-Spec Lower Parts Kit
Sale: $49.99MSRP: $59.99AR-15 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 Catch...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 -
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 -
MAGPUL MOE STOCK - MILSPEC - BLACK
$44.95Magpul MOE Carbine Stock - Black Sloping cheek weld combines a slim profile with user comfort Shielded release latch prevents snagging and accidental operation Premium chrome-silicon lock spring provides positive locking and long service life Side...$44.95 -
On Sale
Grid Defense AR10 Lower Parts Kit
Sale: $59.00MSRP: $79.00Grid Defense AR10 Lower Parts Kit Includes: Trigger Group A2 Grip Buffer Retainer Pin Buffer Retainer Spring Trigger Guard Safety Selector Bolt Catch Spring Detent Spring Bolt Catch Plunger Bolt...Sale: $59.00MSRP: $79.00 -
Out of stockOn Sale
Grid Defense AR-15 80% Lower Receiver With Fire/Safe Engravings - Black
Sale: $55.00MSRP: $150.00Grid Defense AR-15 80% Lower Receiver With Fire/Safe Engravings - Black Machined from 7075-T6 Aluminum Forging 8625 Type III Hardcoat Anodize – Black Flared and broached magazine well Rear upper lug pocket cut out Fits all mil-spec upper...Sale: $55.00MSRP: $150.00 -
TAKEDOWN/PIVOT PIN SPRING - AR15
$1.99TAKEDOWN PIN SPRING /PIVOT PIN SPRING - AR15 Compatible with AR15/M4 Lower Receivers AR15 Takedown Pin Spring American Made$1.99 -
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 -
BUFFER RETAINER SPRING - AR15
$1.99BUFFER RETAINER SPRING Compatible with AR15/M4 Lower Receivers American Made$1.99 -
Out of stock
Grid Defense AR-15 Skeletonized 80% Lower Receiver With Optional Fire/Safe Engravings
$45.00 - $65.00Grid Defense AR-15 Skeleton 80% Lower Receiver With Optional Fire/Safe Engravings Machined from 7075 Forged Aluminum Made in house in the USA Flared and Broached Magwell Available in Raw Aluminum, Hard Coat Black Anodized, FDE, OD Green, Burnt...$45.00 - $65.00 -
MIL-SPEC CARBINE BUFFER TUBE KIT WITH MAGPUL MOE CARBINE STOCK
$79.95MIL-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 Black...$79.95 -
Magpul MOE Plus AR Grip - Black
$23.95Magpul MOE Plus AR Grip - Black AR15/M4 Pistol Grip Beavertail Backstrap Anti Slip Texture Reinforced Polymer Construction 25 Degree Angle Grip Weighs 3.4oz Made in the USA$23.95 -
TAKEDOWN/PIVOT PIN DETENT
$1.99TAKEDOWN PIN SPRING /PIVOT PIN SPRING - AR15 Compatible with AR15/M4 Lower Receivers American Made$1.99 -
Out of stockOn 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 -
Ghost Firearms Complete Lower Pistol Build Kit
$89.99Ghost Firearms Complete Lower Pistol Build Kit Trigger Group A2 Grip Buffer Retainer Pin Buffer Retainer Spring Trigger Guard Safety Selector Bolt Catch Spring Detent Spring Bolt Catch Plunger Bolt...$89.99 -
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 -
Out of stockOn 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 Grip - Tungsten Gray
Sale: $69.00MSRP: $79.00Tactical Dynamics Skeleton Grip - Tungsten Gray Finished in Tungsten Gray Cerakote Machined from 7075-T6 Aluminum Durable and Lightweight Compatible with AR15/AR10 Platforms Unique Design Made in the USASale: $69.00MSRP: $79.00