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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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 -
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 -
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 -
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 -
On Sale
Grid Defense Lower Receiver Spring Replacement Kit
Sale: $10.95MSRP: $13.95Grid Defense Lower Receiver Spring Replacement Kit Take Down Pin Detent Springs (2) Buffer Retainer Spring Hammer Spring trigger Spring Disconnect Spring Bolt Catch Spring Magazine Catch Spring Selector Detent SpringSale: $10.95MSRP: $13.95 -
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 -
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 -
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 -
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