Brand: Griffin Armament
Model: MK1 PSD
Platform: AR-15
Caliber: .300 Blackout
Barrel Length: 9.5"
Gas Block Diameter: .750"
Gas Block Type: Low Profile PRIMO Gas Block
Gas System: Pistol-Length / Direct Impingement
Barrel Material: 416R Stainless Steel
Barrel Description: Griffin HEDP / Nitride Finish
Muzzle Device: Taper Mount Tactical Compensator
Muzzle Thread: 5/8 x 24
Receiver Material: 7075-T6 Aluminum
Receiver Finish: Terra Brown Cerakote
Handguard: 8.5" Low Profile Rail System
Handguard Finish: Terra Brown Cerakote
Attachment Style: M-LOK
Bolt Carrier Group: Griffin BCG
Charging Handle: Griffin SN-ACH

Features

The Griffin Armament MK1 PSD complete upper is a purpose-built AR platform component chambered in .300 Blackout, engineered for durability, reliability, and compact performance. Featuring a 9.5-inch barrel, this configuration enhances maneuverability while maximizing the performance characteristics of the .300 Blackout cartridge, making it well-suited for both suppressed and unsuppressed applications.

Constructed for strength and consistent accuracy, the MK1 PSD upper utilizes a free-float handguard to preserve barrel harmonics and improve shot consistency. The MLOK interface provides flexible accessory mounting options, while the robust receiver construction supports long-term durability under demanding conditions. Designed as a complete upper, it offers a dependable and adaptable solution for building or upgrading a modern AR platform.

*Muzzle Device In Images May Differ From Product

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Shipping Restrictions

It is the customer’s responsibility for understanding state laws regarding all purchases made. For a comprehensive list of all Shipping Restrictions, please refer to our Shipping Restrictions By State Page found Here.

All NFA Rules Apply

These items are controlled by the U.S. Government and authorized for export only to the country of ultimate destination for use by the ultimate consignee or end-user(s) herein identified. They may not be resold, transferred, or otherwise disposed of, to any other country or to any person other than the authorized ultimate consignee or end-user(s), either in their original form or after being incorporated into other items, without first obtaining approval from the U.S. government or as otherwise authorized by U.S. law and regulations.

Local Law Compliance

Certain firearm parts and accessories, including AR-style upper receivers, are subject to complex and frequently changing federal, state, and local laws and regulations. While an upper receiver may be lawfully sold and shipped as a component, the legality of possessing, assembling, configuring, or using an upper receiver in certain states (e.g., California, Washington State) and localities depends on how it is assembled, combined with other components, and ultimately used. You are solely responsible for ensuring that any assembly, configuration, possession, or use complies with all federal, state, and local laws, including any so-called “assault weapon” bans and short-barreled rifle restrictions. We do not provide legal advice and are not responsible for unlawful configurations or uses.