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
MAGPUL MOE CARBINE STOCK MIL-SPEC PINK
$39.95MAGPUL MOE CARBINE STOCK MIL-SPEC PINK Sloping cheek weld combines a slim profile with user comfort Shielded release latch prevents snagging and accidental operation Premium chrome-silicon lock...$39.95 -
Magpul MOE-K Grip AR15/M4 - FDE
$20.95Magpul MOE-K Grip - Flat Dark Earth Compact and Thin Minimalist Design Constructed from Reinforced Polymer More Angled Vertical Grip than Standard A2 Grip Aggressive TSP Texture Weighs 2...$20.95 -
Odin Works XMR2 Extended Mag Release - Gen 2
$22.00Odin Works XMR2 Extended Mag Release - Gen 2 Compatible with BAD Lever. Will not work with anti-walk pins without modification to the XMR2 .1 oz (including paddle, button, and screws) Large...$22.00 -
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 -
SPIKE'S ST-T1 TUNGSTEN HEAVY BUFFER
$32.95ST-T1 TUNGSTEN Spikes Heavy Buffer Material:Â Solid Aluminum Billet Finish:Â Black Anodized Features:Â Crushed Tungsten, Mil-Spec Bumper Weight:$32.95 -
Strike Industries Advanced Receiver Extension - Black
$52.95Strike Industries Advanced Receiver Extension - Black 7075-T6 Aluminum Supported buffer retaining tab$52.95 -
Strike Industries Advanced Receiver Extension - Red
$52.95Strike Industries Advanced Receiver Extension - Red The Strike Industries Advanced Receiver extension brings an updated aesthetic and increased functionality to an often neglected, yet highly...$52.95 -
STRIKE INDUSTRIES BILLET TRIGGER GUARD - BLACK
$25.95STRIKE INDUSTRIES BILLET TRIGGER GUARD - BLACK Aircraft grade aluminum construction Magazine reload assist Cleaner, faster reloads Functions as safe trigger finger index...$25.95 -
Out of stock
TIMBER CREEK AR MAGAZINE RELEASE BUTTON - BLUE
$7.99AR MAGAZINE RELEASE BUTTON - BLUE Billet 6061-T6 aluminum Compatible with all Milspec lowers Manufactured by Timber Creek Outdoors Made in the USA Blue Anodized Finish$7.99 -
Out of stock
TIMBER CREEK AR MAGAZINE RELEASE BUTTON - BURNT BRONZE
$7.99AR MAGAZINE RELEASE BUTTON - BURNT BRONZE Made in the USA Timber Creek Outdoor Inc., Manufactured Compatible with milspec lower receivers Lightweight billet aluminum Burnt Bronze Cerakote...$7.99 -
Out of stock
TIMBER CREEK AR MAGAZINE RELEASE BUTTON - RED
$7.99AR MAGAZINE RELEASE BUTTON - RED Made in the USA Lightweight aluminum Billet magazine release button Manufactured by Timber Creek Outdoors Red Anodized FinishÂ$7.99 -
Out of stock
TIMBER CREEK AR TAKEDOWN PIN SET - RED
$19.99AR TAKEDOWN PIN SET - RED Machined from billet aluminum Anodized finish Compatible with M4/AR15 lower receivers Made in the USA$19.99 -
Out of stock
AR Competition Drop-In Trigger System - 3.5LB
$99.99AR Competition Drop-In Trigger System - 3.5LB Single Stage Drop-In Trigger System Pull weight of 3.5 lb Trigger Group constructed of Heat Treated Tool Steel 6061 Billet Aluminum...$99.99 -
AR-15 Mil-Spec Carbine Length Buffer Spring
$5.99Maintain smooth, reliable cycling and consistent ejection in your rifle with the AR-15 Carbine Length Buffer Spring. Engineered to strict military specification standards, this action spring delivers...$5.99 -
Armaspec Stealth Spring - Big Bore
$84.99Armaspec Stealth Spring - Big Bore Drop-in replacement for standard buffer and spring. Reduce felt recoil. Keep the buffer spring from rubbing against the inner wall of the buffer tube. Buffer...$84.99 -
B5 Systems Mil-Spec Stock - Black
$62.00B5 Systems Mil-Spec Stock - Black Ergonomic cheek weld. Color-matched steel hardware. Overmolded steel anti-rotational QD sling mounts. Fixed sling mounts Internal tensioners.$62.00 -
B5 Systems Mil-Spec Stock - FDE
$62.00B5 Systems  Mil-Spec Stock - FDE Ergonomic cheek weld. Color-matched steel hardware. Overmolded steel anti-rotational QD sling mounts. Fixed sling mounts Internal tensioners.$62.00 -
B5 Systems Medium Length Collapsible Precision Stock - FDE
$230.00B5 Systems Medium Length Collapsible Precision Stock - FDE Adjustable cheekweld and buttpad with precision dials. Mounting slots for Accessory Cheekpiece. 12 internal tensioners. Color matched...$230.00 -
Bravo Company Mod 0 Sopmod Stock Kit - FDE
$124.00Bravo Company Mod 0 Sopmod Stock Kit - FDE BCM 7075T6 Mil-Spec Receiver Extension Locking Nut M4 Mil-Spec Carbine Action Spring Carbine Buffer BCM QD Swivel Mount End Plate$124.00Out of stock
Bravo Company Trigger Guard Mod 0 - Black
$8.00Bravo Company Trigger Guard Mod 0 - Black Ergonomically correct shape and contour No sharp edges, Compatible with "duck-billed" grips Made of impact resistant polymer$8.00