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 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 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 -
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 -
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 -
Out of stock
Battle Arms Development Enhanced .308 Bolt Catch
$17.00Battle Arms Development Enhanced .308 Bolt Catch Weight 0.53oz Compatible with Norgon Ambi-Catch Without Interference Raised "T-Shaped" Heel Provides Positive and Distinctive Control Surface for Bolt Lock Back Bold Horizontal and Diagonal...$17.00 -
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 -
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
$250.00Geissele 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...$250.00 -
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 -
Out of stock
Grid Defense Pistol Stabilizing Fin - Burnt Bronze
$49.99Grid Defense Pistol Stabilizing Fin - Burnt Bronze -Constructed from Reinforced Polymer -Increases Weapon Control and Stability -Weighs 5.7oz -Fits Pistol Buffer Tube up to 1.25" (Not Included) -Finished in Burnt Bronze Cerakote$49.99 -
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 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 Pistol Buffer Tube
$20.00Mil-Spec Pistol Buffer Tube Made in the USA Machined from 7075-T6 Aluminum Smooth Buffer Tube for Pistols Weight: Available in Black Anodize or Cerakote Finish$20.00 -
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