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
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 Mil-Spec Lower Parts Kit - FDE
Sale: $59.99MSRP: $79.99Ghost Firearms Mil-Spec Lower Parts Kit - FDE FDE Cerakote Trigger Group FDE Cerakote A2 Grip Buffer Retainer Pin Buffer Retainer Spring Trigger Guard Safety Selector Bolt Catch Spring Detent Spring Bolt...Sale: $59.99MSRP: $79.99 -
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 Pistol Buffer Tube Assembly
$30.00 - $35.00Mil-Spec Pistol Buffer Tube Assembly Made in the USA 1.25" Outer Diameter Machined from 7075-T6 Aluminum End Plate Castle Nut Carbine Buffer Spring Carbine Buffer Available in Black Anodize and Cerakote Finishes$30.00 - $35.00 -
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 Intermediate Buffer Tube -Ambi Sling/QD Plate Length of pull:...$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 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 -
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 -
PHASE5 WINTER TRIGGER GUARD - RED
$25.00PHASE5 WINTER TRIGGER GUARD RED Winter Trigger Guard Lightweight Manufactured by Phase 5 Weapon Systems Made In The USA$25.00 -
Out of stock
SKELETONIZED ELITE TRIGGER GUARD - ZOMBIE GREEN
$25.99PREMIUM SKELETONIZED ELITE TRIGGER GUARD - ZOMBIE GREEN This Skeletonized 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...$25.99 -
Out of stock
Strike Industries Advanced Receiver Extension - Blue
$52.95Strike Industries Advanced Receiver Extension - Blue The Strike Industries Advanced Receiver extension brings an updated aesthetic and increased functionality to an often neglected, yet highly important component of the AR15/AR10 weapon system...$52.95 -
STRIKE INDUSTRIES FANG BILLET TRIGGER GUARD - BLUE
$21.95STRIKE INDUSTRIES FANG BILLET TRIGGER GUARD - BLUE Contents:- 1x Aluminum Trigger Guard- 4x M3 Hex Screw- 1x Warning card Features:- Aircraft grade aluminum construction- Magazine reload assist- Cleaner, faster reloads- Lightweight (.4 oz with...$21.95 -
TIMBER CREEK RECEIVER EXTENSION PLATE - FLAT DARK EARTH
$69.99TIMBER CREEK RECEIVER EXTENSION PLATE - FLAT DARK EARTH Drop in replacement Fits any milspec buffer tube Lightweight Made in the USA$69.99 -
Out of stock
2A Armaments Builder Series Solid Trigger Guard
$14.992A Armaments Builder Series Solid Trigger Guard Precise Manufacturing Long Term Reliability Durable Construction Black Anodized Finish For Ar-15 Rifles$14.99