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
Grid Defense Lower Pistol Build Kit Nickel Boron
$99.00Ghost Firearms Lower Pistol Build Kit Nickel Boron Nickel Boron Trigger Group A2 Grip Buffer Retainer Pin Buffer Retainer Spring Trigger Guard Safety Selector Bolt Catch Spring Detent Spring Bolt Catch...$99.00 -
Magpul CTR Stock Mil-spec - Black
$64.95Magpul CTR Carbine Stock - Black FEATURES Mounts on mil-spec sized carbine receiver extension tube (not included) from manufacturers such as Colt, Armalite, S&W, LMT, and others (please see the note below) Supplemental friction lock...$64.95 -
On Sale
Grid Defense AR-15 80% Lower Receiver Without Fire/Safe Engravings - FDE
Sale: $69.00MSRP: $170.00Grid Defense AR-15 80% Lower Receiver without Fire/Safe Engravings - FDE Machined from 7075-T6 Aluminum Forging Finished in Magpul Flat Dark Earth Cerakote Flared and broached magazine well Rear upper lug pocket cut out Fits all mil-spec upper...Sale: $69.00MSRP: $170.00 -
On Sale
Tactical Dynamics Skeleton Stock - FDE
Sale: $56.00MSRP: $109.00Tactical Dynamics Skeleton Stock Finished in Magpul Flat Dark Earth 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 -
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
Adaptive Tactical EX Performance Stock - FDE
$59.99Adaptive Tactical EX Performance Stock - FDE Designed for owner installation Covered take down pin makes installation and removal easier and eliminates discomfort M4-style stock with adjustable length-of-pull Easy to reach rapid adjust...$59.99 -
Elite Trigger Guard
$24.99Premium ELITE Trigger Guard This trigger guard is the premium option from the Vital trigger guard that comes standard with all completed lowers. With it's slim design, it offers coverage where it is needed serving its purpose. Being made from...$24.99 -
On Sale
Grid Defense AR Lower Takedown/Pivot Pin Spring and Detent Replacements
Sale: $4.49MSRP: $9.99Grid Defense AR Lower Takedown/Pivot Pin Spring and Detent Replacements Machined from quality corrosion resistant stainless steel Made in the U.S.A. AR-15 and AR-15 3x Takedown / Pivot Pin Detents 2x Takedown / Pivot Pin Detent SpringsSale: $4.49MSRP: $9.99 -
Creed Monarch AR15 Heavy Carbine Buffer
$23.00AR15 H1 Carbine Buffer Made in the USA Machined from Top Quality Material Weighs 3.8oz Manufactured by Creed Monarch$23.00 -
SELECTOR DETENT SPRING - AR15
$1.99DETENT SELECTOR SPRING Compatible with AR15/M4 Lower Receivers American Made$1.99 -
Ghost Grip - FDE
$19.99The Ghost Grip is designed for Made In the USA Made From: reinforced Plastic composite Slim Lightweight Design Incorporates finger groves to insure a tight and comfortable hold Ghost "G" Engraved into the left hand side of...$19.99 -
Out of stock
MAGPUL MOE STOCK MILSPEC - Flat Dark Earth
$44.95Magpul Moe Stock MilSpec - Flat Dark Earth Made in the USA Weighs 8.0oz Length - 6.9" LOP Adjustment Range - 3.3 inch Sling Mounts (Rear/Bottom 1.25" Sling Loops|Toe-Lanyard Hole for Custom Para Cord Rigs) Compatible with Magpul ASAP/ASAP QD and...$44.95 -
Magpul B.A.D. Lever - Battery Assist Device - AR15/M4
$32.95Magpul B.A.D. Lever - Battery Assist Device - AR15/M4 Improves the Speed and Efficiency of the AR15/M16 Bolt Catch Machined from Billet 6061-T6 Aluminum Functional for Left and Right Handed Shooters All Mounting Hardware Included Compatible with...$32.95 -
MIL-SPEC CARBINE BUFFER TUBE - OD GREEN
$30.00MIL-SPEC CARBINE BUFFER TUBE - OD GREEN Made in the USA Compatible with M4 Type Butt Stocks 6 Position Machined from 7075-T6 Aluminum Weight: 3.6oz OD Green Cerakote Finish$30.00 -
STRIKE INDUSTRIES ULTRA LIGHT PIVOT / TAKEDOWN PINS - BLUE
$16.95STRIKE INDUSTRIES ULTRA LIGHT PIVOT AND TAKEDOWN PINS - BLUE Billet 7075 aluminum Blue Finish Extended grasping surface Extended pivot pin / 1.31" length Extended takedown pin /1.08" length For AR-15 lowers Ultra light and ultra strong...$16.95 -
MAGAZINE CATCH SPRING - AR15
$1.99MAGAZINE CATCH SPRING Compatible with AR15/M4 Lower Receivers American Made$1.99 -
Out of stockOn Sale
Ghost Grip - Blue Titanium
Sale: $8.99MSRP: $19.99Ghost Grip - Blue Titanium Made In the USA Made From: reinforced Plastic composite Slim Lightweight Design Incorporates finger groves to insure a tight and comfortable hold Ghost "G" Engraved into the left hand side of the...Sale: $8.99MSRP: $19.99 -
On Sale
SB Tactical SBA4 Adjustable Pistol Brace With Grid Defense Buffer Tube Kit - Black
Sale: $119.95MSRP: $169.95SBA4 with Grid Defense Buffer Kit - Black SB Tactical SBA4 Pistol Stabilizing Brace Complete Grid Defense Buffer Tube Assembly Kit Carbine buffer (3 oz) Carbine buffer spring Carbine stock end plate Carbine stock lock ring-castle nutSale: $119.95MSRP: $169.95 -
On Sale
Tactical Dynamics Skeleton Stock - Raw
Sale: $56.00MSRP: $99.00Tactical Dynamics Skeletonized Stock Made in the USA Raw 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: $99.00 -
Out of stock
TIMBER CREEK AMBIDEXTROUS SAFETY SELECTOR - BURNT BRONZE
$39.99AMBIDEXTROUS SAFETY SELECTOR - BURNT BRONZE For the left or right hand shooters Timber Creek Ambi Safety Drop in replacement safety selector Manufactured by Timber Creek Outdoors Allows for multiple configurations$39.99