AR-15 | AR-10
Grid Defense is the first stop for your next AR15 build with our wide variety of barreled upper receivers to choose from. We offer a multitude of options from barrel length, color, handguard designs, and caliber. Whether you are a beginner or experienced gunsmith our uppers are designed to be easy to expand while staying cost friendly. Check out our Upper and Lower parts for everything else you need to complete your build.
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Out of stockOn Sale
Grid Defense 10.5" .300 Blackout Upper Receiver - Tactical Grape
Sale: $299.00MSRP: $379.00Grid Defense 10.5" .300 Blackout Upper Receiver - Tactical Grape Finished in Purple Cerakote Mil-Spec 7075-T6 Upper Receiver 10.5" 1:8 Twist 4150 Steel Barrel - Black Nitride Chambered in .300 Blackout (7.62x35) A2 Muzzle Device Pistol Length Gas System...Sale: $299.00MSRP: $379.00 -
Out of stock
Grid Defense 16" .300 Blackout Quad Rail Upper Receiver - Tactical Grape
$399.00Grid Defense 16" 5.56 Quad Rail Upper Receiver - Tactical Grape Tactical Grape Cerakote Finish Chambered in .300 Blackout 14" M-Lok Quad Rail 16" 1:8 4150 Barrel - Black Nitride Pistol Length Gas System A2 Flash Hider Mil-Spec 7075-T6 Upper Receiver$399.00 -
On Sale
GRID DEFENSE 16" .450 BUSHMASTER UPPER RECEIVER - BLUE TITANIUM
Sale: $349.00MSRP: $419.00Grid Defense 16" .450 Bushmaster Upper Receiver - Blue Titanium Finished in Blue Titanium Cerakote Chambered in .450 Bushmaster 14" Free Floating M-Lok Handrail 16" 4150 Black Nitride Barrel 1:24 Twist Rate 11/16x24 TPI Thread Pitch .875 Gas...Sale: $349.00MSRP: $419.00 -
On Sale
GRID DEFENSE 16" .450 BUSHMASTER UPPER RECEIVER - FDE
Sale: $349.00MSRP: $419.00Grid Defense 16" .450 Bushmaster Upper Receiver - FDE Hard Coat Flat Dark Earth Finish Chambered in .450 Bushmaster 14" Free Floating M-Lok Handrail 16" 4150 Black Nitride Barrel 1:24 Twist Rate 11/16x24 TPI Thread Pitch .875 Gas Block Carbine...Sale: $349.00MSRP: $419.00 -
Out of stock
GRID DEFENSE 16" 5.56 NATO UPPER WITH 416R STRAIGHT FLUTED BARREL AND 12" MLOK
$429.00GRID DEFENSE 16" 5.56 NATO UPPER - STRAIGHT FLUTED BARREL Made in the USA Mil Spec AR15 Upper Receiver 16" 416R 1:8 Twist Barrel .750 Low Profile Gas Block Carbine Length Gas System Stainless Steel A2 Flash Hider and Crush Washer 12" Grid Defense M-LOK...$429.00 -
Out of stock
Grid Defense 16" 5.56 Quad Rail Upper Receiver with Timber Creek Accessories - Blue Titanium
$757.97Grid Defense 16" 5.56 Quad Rail Upper Receiver With Timber Creek Red Accessories - Blue Titanium Grid Defense 16" 5.56 Quad Rail Upper Receiver - Blue Titanium Blue Titanium Cerakote Finish Chambered in 5.56x45 NATO 14" M-Lok Quad Rail 16" 1:7 4150 M4...$757.97 -
On Sale
Grid Defense 16" 8.6 Blackout Billet Upper - Blue Titanium
Sale: $429.00MSRP: $569.00Grid Defense 16" 8.6 Blackout Billet Upper - Blue Titanium Billet DPMS High Profile Pattern upper 16" 4150 chrome moly barrel Carbine length gas system Chambered in 8.6 Blackout 1:10 Twist Rate M18.x1.5 TPI Thread Pitch .750 Gas Block A2 Flash...Sale: $429.00MSRP: $569.00 -
Out of stockOn Sale
Grid Defense 16" 8.6 Blackout Billet Upper - Tungsten Gray
Sale: $429.00MSRP: $569.00Grid Defense 16" 8.6 Blackout Billet Upper - Tungsten Gray Billet DPMS High Profile Pattern upper 16" 4150 chrome moly barrel Carbine length gas system Chambered in 8.6 Blackout 1:10 Twist Rate M18x1.5 TPI Thread Pitch .750 Gas Block A2 Flash Hider...Sale: $429.00MSRP: $569.00 -
Out of stockOn Sale
Grid Defense 18" .308 Winchester Billet Upper - Tungsten Gray
Sale: $439.00MSRP: $579.00Grid Defense 18" .308 Winchester Billet Upper - Tungsten Gray Billet DPMS Pattern High Profile Upper Receiver 18" 4150 Chrome Moly Barrel Rifle Length Gas System Chambered in .308 Winchester 1:10 Twist Rate 5/8x24 TPI Thread Pitch Axe Brake Muzzle...Sale: $439.00MSRP: $579.00 -
On Sale
Grid Defense 18" 350 Legend Upper Receiver - Blue Titanium
Sale: $349.00MSRP: $419.00Grid Defense 18" 350 Legend Upper Receiver - Blue Titanium Blue Titanium Cerakote Finish Chambered in 350 Legend A2 Flash Hider 18" 1:16 Twist 4150 Barrel - Black Nitride Carbine Length Gas System 5/8x24 Thread Pitch Grid Defense 14" M-Lok Free Float...Sale: $349.00MSRP: $419.00 -
On Sale
Grid Defense 18" 6.5 Creedmoor Billet Upper - Burnt Bronze
Sale: $389.00MSRP: $579.00Grid Defense 18" 6.5 Creedmoor Billet Upper - Burnt Bronze Upper Specifications Billet Upper Receiver Machined from 6061 Aluminum Fits DPMS Gen 1 Lower Receivers Made in the USA High Profile 15" Free Float M-LOK Handguard Finished in Burnt...Sale: $389.00MSRP: $579.00 -
On Sale
Grid Defense 18" 6.5 Creedmoor Billet Upper - Tungsten Gray
Sale: $389.00MSRP: $579.00Grid Defense 18" 6.5 Creedmoor Billet Upper - Tungsten Gray Upper Specifications Billet Upper Receiver Machined from 6061 Aluminum Fits DPMS Gen 1 Lower Receivers Made in the USA High Profile 15" Free Float M-LOK Handguard Finished in Tungsten...Sale: $389.00MSRP: $579.00 -
Out of stockOn Sale
Grid Defense 20" .308 Winchester Billet Upper - OD Green
Sale: $449.00MSRP: $589.00Grid Defense 20" .308 Upper Receiver - OD Green DPMS Pattern upper 20" 4150 Chrome Moly Barrel Rifle Gas System Chambered in .308 Winchester 1:10 Twist Rate 5/8x24 Thread Pattern Axe Brake Muzzle Device 15" M-LOK Free Floating Rail Finished in OD Green...Sale: $449.00MSRP: $589.00 -
On Sale
Grid Defense 20" 6.5 Grendel Upper Receiver - Black
Sale: $329.00MSRP: $419.00Grid Defense 20" 6.5 Grendel Upper Receiver - Black Upper Specifications Mil-Spec Upper Design Machined from 7075-T6 Forging Mil-Spec dust cover and forward assist Made in the USA 14" Free Float Handguard Barrel Specifications 20" Heavy...Sale: $329.00MSRP: $419.00 -
On Sale
Grid Defense 20" 6.5 Grendel Upper Receiver - Blue Titanium
Sale: $329.00MSRP: $419.00Grid Defense 20" 6.5 Grendel Upper Receiver - Blue Titanium Upper Specifications Mil-Spec Upper Design Machined from 7075-T6 Forging Mil-Spec dust cover and forward assist Made in the USA 14" Free Float Handguard Finished in Blue Titanium...Sale: $329.00MSRP: $419.00 -
On Sale
Grid Defense 20" 6.5 Grendel Upper Receiver - Burnt Bronze
Sale: $329.00MSRP: $419.00Grid Defense 20" 6.5 Grendel Upper Receiver - Burnt Bronze Upper Specifications Mil-Spec Upper Design Machined from 7075-T6 Forging Mil-Spec dust cover and forward assist Made in the USA 14" Free Float Handguard Finished in Burnt Bronze...Sale: $329.00MSRP: $419.00 -
On Sale
Grid Defense 7.5" .300 Blackout Upper Receiver - Tactical Grape
Sale: $299.00MSRP: $379.00Grid Defense 7.5" .300 Blackout Upper Receiver Finished in Purple Cerakote Mil Spec 7075-T6 Upper Receiver 7.5" 1:8 Twist 4150 Light HBAR Barrel - Black Nitride 7" Grid Defense Octagon M-Lok Rail Pistol Length Gas System A2 Flash Hider Chambered...Sale: $299.00MSRP: $379.00 -
Out of stock
Grid Defense Limited Edition 5.56 Flash Can Upper Receiver - Tungsten Gray/Burnt Bronze
$505.93Grid Defense Limited Edition 5.56 Flash Can Upper Receiver - Tungsten Gray Finished in Tungsten Gray Cerakote 7075-T6 MilSpec Upper Receiver 7.5" 1:7 Twist 4150 Barrel - Black Nitride Chambered in 5.56x45 NATO Burnt Bronze Flash Can 9" M-lok...$505.93 -
Out of stock
Grid Defense Limited Edition 5.56 Flash Can Upper Receiver - Tungsten Gray/Red
$510.89Grid Defense Limited Edition 5.56 Flash Can Upper Receiver - Tungsten Gray Finished in Tungsten Gray Cerakote 7075-T6 MilSpec Upper Receiver 7.5" 1:7 Twist 4150 Barrel - Black Nitride Chambered in 5.56x45 NATO Dimpled Flash Can 9" M-lok Octagon...$510.89 -
Out of stock
Grid Defense Limited Edition 7.5" 5.56 Flash Can Upper With Timber Creek Accessories - Tequila Sunrise
$458.98Grid Defense 7.5" 5.56 NATO Flash Can Upper Receiver - Tequila Sunrise Finished in Tequila Sunrise Cerakote 5.56 Flash Can Upper Made in the USA 1:7 Twist 7.5" 4150 M4 Barrel - Black Nitride 9" Octagon M-Lok Hand Guard Ridgeway Blue Cerakoted...$458.98