Mk109 Mod 2-M 300 AAC Blackout 9.75" Bbl Complete Upper

Name: Mk109 Mod 2-M 300 AAC Blackout 9.75" Bbl Complete Upper
Brand: Primary Weapons Systems
Availability: OutOfStock

Primary Weapons Systems · Upper Receiver

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Best price

$1,299.95at Brownells

Out of stock checked Oct 1, 2026

Buy at Brownells

Where to buy

Store	Price	Availability	Buy	Add to build
Brownells	$1,299.95checked Oct 1, 2026	Out of stock	Buy at Brownells

Prices and availability change often, so confirm on the store's site before you buy. We may earn a commission from these links.

Price history

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Dashed line = out of stock. Tracking since Sep 28, 2026.

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Store	Latest	Lowest	Highest
Brownells	$1,299.95	$1,299.95	$1,299.95

Since Sep 28, 2026.

About this part

The Mk109 Mod 2-M 300 AAC Blackout 9.75" Bbl Complete Upper is an AR-15 complete upper receiver from Primary Weapons Systems. One store lists it, Brownells at $1,299.95.

Fits and works with

Caliber: 300 Blackout · Shop matching ammo
Bolt: Standard AR-15 (5.56 / 300 BLK / .350 Legend) · Bolt carrier groups
Barrel length: 9.75" · Handguards

Specifications

Manufacturer: Primary Weapons Systems
Type: Complete
Platform: AR-15
Caliber: 300 Blackout

From the manufacturer

MK109 MOD 2-M 300 AAC Blackout Complete Upper SPECIFICATIONS: Operating System: PWS Long Stroke Piston System, 3 setting Adjustable Gas Regulator Caliber: .300BLK Gas System Length: Pistol Barrel Length: 9.75" Barrel Twist Rate: 1:8 Muzzle Velocity: 2264 fps Muzzle Device: PWS Triad 30 Upper Receiver: PWS Proprietary Piston Upper, 7075-T651 Hard coat anodize, per Mil 8625 Type lll Class 2 Handguard: PWS PicLok(TM) 8.9" Handguard (1.7" width, 2.25" height) Charging Handle: Radian Raptor(TM) Ambidextrous Charging Handle Mfg: Primary Weapons