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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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 important component of the AR15/AR10 weapon system. The...$52.95 -
Strike Industries AR-15 Lower Parts Kit No Fire Control Group
$60.95Strike Industries AR-15 Lower Parts Kit No Fire Control Group Enhanced Bolt Catch Strike Magazine Catch Enhanced Takedown Pin SI 60-90 Degree 3-in-1 Selector Shaft$60.95 -
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 rest Lightweight Weight 0.5 oz$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 Finish$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 Finish$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 These CNC machined pins are drop in replacements for Mil-Spec lowers and allow easier disassembly of your...$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 Housing Semi-Flat Trigger Bow Fits: AR-15/AR-10 Black...$99.99 -
Armaspec AR-15 Stainless Steel Takedown/Pivot Pins
$15.99Armaspec AR-15 Stainless Steel Takedown/Pivot Pins Includes Takedown and Pivot pins that work with an AR15, M16 or M4 Ultra-Lightweight Built-in Dimples for easy pushing in Bullet tip and EZ-set hole for detent installation Made with...$15.99 -
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 mass is designed to stay under constant tension against...$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. No slip cushioned butt pad. Suregrip stock latch. Made of Milspec...$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 machined hardware. Fixed sling mounts. Steel...$230.00 -
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 -
Daniel Defense AR15 Lower Parts Kit
$115.00Daniel Defense AR15 Lower Parts Kit - Black Mil-Spec AR15 Lower Parts Kit Compatible with Multiple Calibers A2 Pistol Grip Magpul Trigger Guard Made in the USA Daniel Defense Lower Parts Kit$115.00 -
Out of stock
Ergo MSR Compact AR-15 Pistol Grip - FDE
$17.99Ergo MSR Compact AR-15 Pistol Grip - FDE MSR Upgraded Pistol Grip Aggressive Texturing Integral rear upper extension supports the web of the shooters hand Mounting hardware included$17.99 -
Out of stock
HEXMAG AR15 ADVANCED TACTICAL GRIP - BLACK
$29.99HEXMAG AR15 ADVANCED TACTICAL GRIP - BLACK Fits AR-15 and AR-10 platforms 17 for pistols/SBRs" 25 degree for standard angle or 33 degree for long range Made from fiber-reinforced polymer HexMag's AR-15 Advanced Tactical Pistol Grip features a...$29.99 -
On Sale
Magpul STR Carbine Stock - Black
Sale: $76.45MSRP: $84.95Magpul STR Carbine Stock Compatible with Milspec Carbine Buffer Tube AR15/M4 Butt Stock Reinforced Polymer Construction Improved Cheek Weld Two Water Resistant Battery Tubes QD Sling Mount 0.30" Thick Butt Pad Made in the USASale: $76.45MSRP: $84.95 -
PHASE5 OVERSIZED MAGAZINE RELEASE RED
$21.99PHASE 5 MAG RELEASE - OVERSIZED MAGAZINE RELEASE Features: Larger contact surface than a Mil-Spec magazine release button Ergonomic pocket on surface of paddle for your finger CNC machined from lightweight 6061-T6...$21.99 -
Out of stock
RADIAN WEAPONS AR15 AMBIDEXTROUS TALON SAFETY SELECTOR 2-LEVER KIT - TUNGSTEN GRAY
$49.95AMBI TALON SAFETY SELECTOR 2-LEVER KIT - TUNGSTEN GRAY The Talon™ ambidextrous safety selector is a modular design that can be installed as a standard 90° or as a 45° short throw by simply rotating the shaft 180° inside the lower...$49.95 -
Out of stock
RADIAN WEAPONS RAPTOR AMBI TALON SAFETY SELECTOR 2-LEVER KIT - NP3
$74.95AMBI TALON SAFETY SELECTOR 2-LEVER KIT - NP3 The Talon™ ambidextrous safety selector is a modular design that can be installed as a standard 90° or as a 45° short throw by simply rotating the shaft 180° inside the lower receiver...$74.95