Yankee Hill Machine Resonator .300 BLK Integrally Suppressed Upper

Description

The Yankee Hill Machine Resonator Integrally Suppressed Upper is an integrally suppressed upper receiver system built for .300 BLK. Manufacturer materials describe a Resonator suppressor that is pinned and welded to the barrel, and the system includes an MR7 M-LOK 9″ handguard and a flat top A3 upper receiver. This upper is supplied without a bolt carrier assembly or charging handle, and it is intended for installers and builders who will supply those components separately.

Key Specifications

• The caliber is .300 BLK (.300 AAC Blackout).
• The suppressor is constructed with 17-4 Ph stainless steel with Cobalt-6 blast baffles.
• The manufacturer lists a measured decibel rating of 127 dB for .300 BLK subsonic loads.
• The unit is listed as full auto rated by the manufacturer.
• The external finish is matte black.
• The suppressor body diameter measures 1.5625 inches.
• The package includes a Resonator sound suppressor assembly, MR7 M-LOK 9″ handguard, flat top A3 upper receiver, low-profile suppressor gas block, and black plated gas tube.
• Bolt Carrier Assembly and Charging Handle not included with this upper receiver group.
• The ATF designation is listed as Resonator (Silencer).

The Resonator integrally suppressed upper assembles factory-grade suppressor technology with a lightweight M-LOK handguard and a flat-top A3 upper receiver to provide a compact, NFA-classified solution for .300 BLK platforms. Its construction and listed performance characteristics make it suitable for shooters and builders seeking an integrated suppressed option that reduces the number of NFA items required. For those outfitting a project or upgrading an existing rifle, the Resonator upper delivers a purpose-built suppressed interface and a complete upper receiver package ready for installation of user-supplied bolt and charging components.