TacFire 10.5inch UNASSEMBLED .300 AAC PISTOL BUILD KIT BLACK
$309.99 at GunMag Warehouse · 4 stores
In stock
Grid Defense Complete Upper Receiver .300 Blackout 7.5in Pistol Length 4150 Light HBAR Barrel 1-8 Twist 9in Octagon M-LOK Hand Guard Dimpled Flash Can
No ratings yetBest price
$319.99at OpticsPlanet
Out of stock Sale checked Oct 22, 2026
In stock now instead
- TacFire 10.5inch UNASSEMBLED .300 AAC PISTOL BUILD KIT BLACK $309.99at GunMag Warehouse
- 300BLK 16" Socom Pistol Bbl Complete Upper Receiver For AR15 $307.56at Kentucky Gun Co
- XTS Complete Upper Receiver w/o BCG AR-15 300 BO 24.75in 16in B… $289.99at OpticsPlanet
Where to buy
| Store | Price | Availability | Buy | Add to build |
|---|---|---|---|---|
| OpticsPlanet | $319.99Salechecked Oct 22, 2026 | Out of stock | Buy at OpticsPlanet |
Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.
Similar upper receivers in stock
This part is out of stock at every store we track. These similar upper receivers are in stock, with today's prices.
300BLK 16" Socom Pistol Bbl Complete Upper Receiver For AR15
$307.56 at Kentucky Gun Co · 4 stores
In stock
XTS Complete Upper Receiver w/o BCG AR-15 300 BO 24.75in 16in Barrel Carbine 1-8 Twist 5/8x24 Thread M-LOK Bird Cage Black Nitride Finish
$289.99 at OpticsPlanet
In stock Sale
300BLK 10.5" Medium Pistol Bbl Complete Upper Receiver
$287.50 at Kentucky Gun Co · 4 stores
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XTS Complete Upper Receiver w/o BCG AR-15 300 BO 19.5in 10.5in Pistol 1-8 Twist 5/8x24 Thread M-LOK Bird Cage Black Nitride Finish
$279.99 at OpticsPlanet
In stock Sale
Tacfire 16" Complete Upper Assembly .300 AAC Blackout 1:8, Black
$269.99 at GunMag Warehouse · 9 stores
In stock
Price history
Dashed line = out of stock. Tracking since Oct 15, 2026.
Show the prices as a table
| Store | Latest | Lowest | Highest |
|---|---|---|---|
| OpticsPlanet | $319.99 | $319.99 | $319.99 |
Since Oct 15, 2026.
About this part
The Grid Defense Complete Upper Receiver .300 Blackout 7.5in Pistol Length 4150 Light HBAR Barrel 1-8 Twist 9in Octagon M-LOK Hand Guard Dimpled Flash Can is an AR-15 complete upper receiver from Grid Defense. One store lists it, OpticsPlanet at $319.99.
Fits and works with
- Caliber
- 300 Blackout · Shop matching ammo
- Bolt
- Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
- Gas system
- Pistol · Handguards
- Barrel length
- 7.5" · Handguards
- Handguard length
- 9" · Barrels
Specifications
- Manufacturer
- Grid Defense
- Type
- Complete
- Platform
- AR-15
- Caliber
- 300 Blackout
From the manufacturer
Grid Defense Complete Upper Receiver .300 Blackout 7.5in Pistol Length 4150 Light HBAR Barrel 1-8 Twist 9in Octagon M-LOK Hand Guard Dimpled Flash Can. 300 Blackout Upper Receiver is an excellent addition to any high-quality AR build. Each of these Grid Defense AR15 Upper Receivers comes with an M-LOK free float handguard that allows for the attachment of accessories and allows your barrel to shoot more accurately. The Mil-Spec Grid Defense .300 Blackout Rifle Upper Receiver is constructed from 7075 T6 aluminum that's rugged yet lightweight. These uppers also include a barrel muzzle device and pistol length gas system. Improve your rifle build by using a Grid Defense 300 Blackout (7.62x35) Upper Receiver. Specifications for Grid Defense .300 Blackout Upper Receiver: Manufacturer: Grid Defense Caliber: .300 AAC Blackout Barrel Profile: 4150 Steel Light HBAR Gas System Length: Pistol Length Barrel Twist Rate: 1-8 Handguard Type: Free-Float Gun Model: AR-15 Fabric/Material: 4150 Steel Gas Block Journal Size-Diameter: .750 in Handguard Style: Thin Rail Gun Rail: M-LOK Gun Type: Rifle Gun Make: AR Platform Weight: 3.4 lb Bolt Carrier Group Included: No Charging Handle Included: No Magazine Included: No Condition: New Mount Type: M-LOK Features of Grid Defense .300 Blackout Upper Receiver: Chambered in .300 Blackout (7.62x35) A2 Flash Hider/Dimpled Flash Can 1:8 Twist Barrel Pistol Length Gas System Grid Defense M-Lok Free Float Hand Guard Grid Defense Mil-Spec 7075 T6 Upper Receiver Package Contents: Grid Defense .300 Blackout Complete Upper Receiver What firearm models does the manufacturer say Grid Defense .300 Blackout Upper Receiver is compatible with? The manufacturer says that Grid Defense .300 Blackout Upper Receiver is compatible with AR-15Grid Defense GD75GDR9FCAN300FDE: Complete Upper Receiver .300 Blackout 7.5 inch Pistol Length 4150 Light HBAR Barrel 1-8 Twist 9 inch Octagon M-LOK Hand Guard Dimpled Flash Can Flat Dark Earth
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