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...$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...Sale: $189.99MSRP: $379.94 -
ATI Outdoors AR-15 X1 Pistol Grip - Black
$29.99ATI Outdoors AR-15 X1 Pistol Grip - Black Fits AR-15/AR-10 Fits the Ruger 22 Charger Pistol with AR-15 Style Grip DuPont(R) Extreme Temperature Glass Reinforced Polymer Scratch & weatherproof$29.99 -
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$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...$45.00 -
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$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...$25.99 -
Out of stock
F.A.B. Defense GL-Core S AR-15 Buttstock - Black
$55.99F.A.B. Defense GL-Core S AR-15 Buttstock - Black Collapsible Rubber Buttpad Small and Compact Design Fits Mil-Spec and Commercial Buffer Tubes$55.99 -
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 GROUPÂ Â 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...$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...$184.99 -
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&n$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...Sale: $434.99MSRP: $1,200.00 -
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$20.95 -
Mission First Tactical Engage AR Pistol Grip - Black
$24.99Mission First Tactical AR Pistol Grip - Black Black finish Tab covers the receiver gaps Secure water resistant storage compartment Plug retention$24.99 -
Odin Works ZULU Stock Kit - Blue
$149.00Odin Works ZULU Stock Kit - Blue Made from 6061 aluminum and Limbsaver recoil pad Secondary Buffer System Reduces Recoil Weight: 1.23 lbs Kit includes: -ZULU Adjustable Stock -Padded...$149.00 -
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 Weapon Systems Ambidextrous 90 Degree Safety Selector - Blue
$49.99Phase5 Weapon Systems Ambidextrous 90 Degree Safety Selector - Blue Fits AR-15 and AR-10 / LR-308 6061-T6 Billet Aluminum Ambidextrous Wide Levers$49.99 -
Phase5 Weapon Systems Ambidextrous 90 Degree Safety Selector - Grey
$49.99Phase5 Weapon Systems Ambidextrous 90 Degree Safety Selector - Grey Fits AR-15 and AR-10 / LR-308 6061-T6 Billet Aluminum Ambidextrous Wide Levers$49.99 -
Rise Armament RAVE-PCC Trigger
$159.99Rise Armament RAVE-PCC Trigger Black Nitride Finish Includes Anti-Walk Pins Durable Construction 3.5 lb trigger pull Designed for use in 9MM AR configurations$159.99