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
AR Enhanced Ambidextrous Safety Selector - Red
$23.99AR Enhanced Ambidextrous Safety Selector - Red For Left or Right-Handed Shooters Replaces Existing Safety Lever Easy-To-Operate Safety Lever on Both Sides of The Receiver Does Not Interfere with Grip Position or Thumb Placement Fits Semi-Auto ...$23.99 -
Out of stockOn Sale
AR-15 80% Lower With Fire/Safe Engravings | SBA4 | Mil-Spec LPK | Carbine Buffer Tube Kit
Sale: $189.99MSRP: $379.94AR-15 80% Lower With Fire/Safe Engravings | SBA3 Pistol Brace | Mil-Spec LPK | Carbine Buffer Tube Kit This AR-15 80% Lower Build Kit provides a solid foundation for your next custom rifle. Featuring an 80% lower receiver with Fire/Safe engravings, an...Sale: $189.99MSRP: $379.94 -
Battle Arms Development AR-15 Nickel Teflon Enhanced Trigger Assembly
$69.00Battle Arms Development AR-15 Nickel Teflon Enhanced Trigger 5.5-6 lbs Trigger Pull Weight Nickel Teflon Made in the USA Hammer Disconnect Trigger Spring, Hammer Spring and Disconnect Spring Included$69.00 -
Battle Arms Development BAD-ASS PRO Ambi Safety Selector
$45.00Battle Arms Development BAD-ASS PRO Ambi Safety Selector Specifications: SKU: BAD-ASS-PRO-1522 UPC: 810033780257 Manufacturer: Battle Arms Development, Inc. Center Material/Finish: Swiss CNC Machined Bar-Stock Steel Core, Hardened, Black...$45.00 -
Bravo Company Gunfighter's Grip Mod3 - FDE
$20.00Bravo Company BCMGUNFIGHTER Grip Mod3 - FDE Fits AR rifles Reduced angle for improved ergonomics Hinged trap door offering storage inside the grip Up to 1/4" wider than Mod 0 and Mod 1$20.00 -
Elftmann Tactical Adjustable Trigger with Curved Shoe - Black
$139.00Elftmann Tactical Adjustable Trigger with Curved Shoe - Black Fits any and all AR platforms Incremental Adjustment Knob Drop-Safe Adjustable from 2 3/4lbs to 4lbs without removing from lower Patented Double-Double torsion hammer spring Short pull...$139.00 -
Out of stock
ERGO 2 Sure Grip - FDE
$25.99ERGO 2 Sure Grip - FDE Design allows installation on both .223 and .308 AR-15/AR-10 type receivers. A2 sized inner cavity compatible with many accessories available on the market. Ergonomically correct finger grooves Integrated rear upper extension...$25.99 -
F.A.B. Defense GL-Core CP AR-15 Buttstock - Tan
$81.99F.A.B. Defense GL-Core CP AR-15 Buttstock - Tan Tan finish Interchangeable buffer tube adapters for a tight fit on Mil-Spec and Commercial buffer tubes Additional" adjustable Cheek-Rest$81.99 -
F.A.B. Defense Gradus AR Pistol Grip - FDE
$29.00F.A.B. Defense Gradus AR Pistol Grip - FDE Ergonomic AR Grip$29.00 -
Out of stock
F1 Firearms GRP Style 1 Grip - Black
$79.99F1 Firearms GRP Style 1 Grip - Black Skeletonized and Textured Construction Type-1 No Finger Grooves Anodized Finish Fits AR Platform Rifles$79.99 -
Out of stock
FAILZERO DROP IN TRIGGER GROUP - CURVED
$179.99FAILZERO TRIGGER GROUP KEY FEATURES: Single-stage trigger system 3.5-lb. pull weight Clean break with a short reset Comfortable, rounded trigger Unit weight: 2.6 oz. CNC machined from high-grade, heat-treated tool steel and...$179.99 -
Out of stock
FAILZERO DROP IN TRIGGER GROUP - FLAT
$184.99FAILZERO TRIGGER GROUP - FLAT KEY FEATURES: Single-stage trigger system 3.5-lb. pull weight Clean break with a short reset Comfortable, flat trigger Unit weight: 2.6 oz. CNC machined from high-grade, heat-treated tool steel and...$184.99 -
Fortis Manufacturing AR-15 Takedown Pins - Rose Gold/Case Hardened
$22.95Fortis Manufacturing AR-15 Takedown Pins - Rose Gold/Case Hardened Mil-spec size tolerance from .247-.2485 Comes in either black nitride coating or case hardened finish Lightweight at 0.34 oz combined Material 17-4 Stainless Steel Made in the USA$22.95 -
Ghost Firearms Mil-Spec Lower Parts Kit - 5 Pack
$299.95Ghost Firearms Mil-Spec Lower Parts Kit - 5 Pack Trigger Group A2 Grip Buffer Retainer Pin Buffer Retainer Spring Trigger Guard Safety Selector Bolt Catch Spring Detent Spring Bolt Catch Plunger Bolt...$299.95 -
Out of stockOn Sale
Grid Defense AR-15 80% Lower Receiver With Fire/Safe Engravings 10 Pack - Raw
Sale: $434.99MSRP: $1,200.00Grid Defense AR-15 80% Lower Receiver 10 Pack - Raw Includes 10 Raw 80% Lower Receivers With Fire/Safe Markigs Machined from 7075 Forged Aluminum Made in house in the USA Flared and Broached Magwell Raw Aluminum Finish Does not have...Sale: $434.99MSRP: $1,200.00 -
On Sale
Grid Defense AR-9 80% Lower Receiver Without Fire/Safe Engravings - Raw
Sale: $74.99MSRP: $179.00Grid Defense AR-9 80% Lower Receiver - Raw Raw Aluminum Finish Machined from 6061 billet aluminum Compatible with any Glock style small frame pistol calibers Compatible with Glock pattern or style magazines Magazine release button and ejector...Sale: $74.99MSRP: $179.00 -
Magpul MOE K-2 AR Pistol Grip - Gray
$20.95Magpul MOE K-2 AR Pistol Grip - Gray Replacement for AR15/M4 pistol-grip One-piece reinforced polymer construction More vertical grip angle than A2 grips Aggressive TSP texture Weight: 2.9oz Thickness: 1.2" Height: 4.1" Grip Angle: 17...$20.95 -
MIL-SPEC CARBINE BUFFER TUBE - PERIWINKLE
$30.00MIL-SPEC CARBINE BUFFER TUBE - PERIWINKLE Made in the USA Compatible with M4 Type Butt Stocks 6 Position Machined from 7075-T6 Aluminum Weight: 3.6oz Periwinkle Cerakote Finish$30.00 -
Phase5 Mag Release Button - Blue
$7.99Phase5 Mag Release Button - Blue Fits AR 5.56/.223 and 7.62/.308 Receivers 6061-T6 Billet Aluminum Anodized Finish$7.99 -
Phase5 Mag Release Button - Red
$7.99Phase5 Mag Release Button - Red Fits AR 5.56/.223 and 7.62/.308 Receivers 6061-T6 Billet Aluminum Anodized Finish The Phase 5™ PMR is a CNC machined 6061-T6 billet aluminum magazine release button. Easy to install, the PMR is a drop in...$7.99