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
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 -
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. No slip cushioned butt pad. Suregrip stock latch. Made of Milspec...$62.00 -
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$124.00 -
Elftmann Tactical Adjustable Trigger - Straight
$139.00Elftmann Tactical Adjustable Trigger - Straight 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 and reset...$139.00 -
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 -
Geissele Automatics Maritime Bolt Catch
$29.00Geissele Automatics Maritime Bolt Catch Increased Surface Area Aggressive Checkering Extended Controls$29.00 -
Geissele Super Semi-Automatic Trigger
$240.00Geissele Super Semi-Automatic Trigger Features Type: 2 Stage 1st Stage Weight: 2.5lbs 2nd Stage Weight: 2.0lbs Total Pull Weight: 4.5lbs Adjustable: No Size: Mil-Spec Trigger Bow Type: M4 Curved Weapon...$240.00 -
Grid Defense Complete AR-15 Rifle Parts Kit - FDE
$124.99Grid Defense Complete Rifle Parts Kit - FDE Lower Parts Kit FDE Cerakote Trigger Group FDE Cerakote A2 Grip Buffer Retainer Pin Buffer Retainer Spring Trigger Guard Safety Selector Bolt Catch...$124.99 -
Grid Defense Pistol Stabilizing Fin - Smith & Wesson Red
$49.99Grid Defense Pistol Stabilizing Fin - Smith & Wesson Red -Constructed from Reinforced Polymer -Increases Weapon Control and Stability -Weighs 5.7oz -Fits Pistol Buffer Tube up to 1.25" (Not Included) -Finished in Smith & Wesson Red Cerakote$49.99 -
Magpul CTR Mil-Spec Stock - Gray
$64.95Magpul CTR Mil-Spec Stock - Gray Mounts on milspec-sized receiver extension tube Shielded release latch Removable butt-pad Sling mounts$64.95 -
Magpul UBR Gen 2 Adjustable Stock - Black
$199.95Magpul UBR Gen 2 Adjustable Stock Compatible with Milspec Carbine as well as A5 and SR-25 Length Buffer Systems AR15/M4 Butt Stock Lightweight and Durable Front and Rear QD Sling Attachment Points Two Footman's Loops Ergonomic MOE SL Angled-Toe...$199.95 -
Out of stock
Maxim Defense CCS Gen 6 Stock - Black
$295.00Maxim Defense CCS Gen 6 Stock - Black Uses Standard Buffer 3 Postition Fits AR-15$295.00 -
Mil-Spec Carbine Buffer Tube
$25.00 - $30.00Mil-Spec Carbine Buffer Tube Made in the USA Compatible with M4 Type Butt Stocks 6 Position Machined from 7075-T6 Aluminum Weight: 3.6oz Available in Black Anodize or Cerakote Finish$25.00 - $30.00 -
Out of stock
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 -
Out of stock
PHASE5 HEX-2 AR15 PISTOL BUFFER TUBE - GRAY
$59.95PHASE5 HEX-2 AR15 PISTOL BUFFER TUBE - GRAY Model: Hex-2Product Type: Buffer TubeFinish/Color: GrayFit: AR-15 PistolAccessories: Includes Castle Nut, End Plate, Foam PadDescription: Specifically designed to fit SIG SB15 Stabilizing Brace$59.95 -
PHASE5 OVERSIZED MAGAZINE RELEASE GRAY
$19.99OVERSIZED PHASE 5 MAGAZINE RELEASE GRAY Features: Larger contact surface than a Mil-Spec Mag Release Button Ergonomic pocket on surface of paddle for your finger CNC machined from lightweight 6061-T6 billet aluminum for...$19.99 -
Out of stock
Radian Weapons AR15 Ambidextrous Talon Safety Selector 4-Lever Kit Tungsten Grey
$87.45AR15 Ambidextrous Talon Safety Selector 4-Lever Kit Tungsten Grey 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...$87.45 -
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 -
Seekins Precision Builder's Kit Lower Parts Kit
$149.00Seekins Precision Builder's Kit Lower Parts Kit Seekins Precision Parts No Trigger Included Ar-15 LPK Trigger Guard Mag Release Bolt Catch Ambi Safety Take Down Pins Pins Detents and Springs$149.00 -
Out of stock
SKELETON GRIP AND TRIGGER GUARD COMBO - BURNT BRONZE
$94.99Tactical Dynamics Skeleton Grip - Burnt Bronze Finished in Burnt Bronze Cerakote Machined from 7075-T6 Aluminum Durable and Lightweight Compatible with AR15/AR10 Platforms Unique Design Made in the USA VITAL AR 15 TRIGGER GUARD - BURNT...$94.99