YHM Resonator .300 BLK Integrally Suppressed Upper

The Yankee Hill Machine Resonator .300 BLK upper receiver group combines an integrally suppressed configuration with a pinned-and-welded Resonator suppressor. It includes an M-LOK handguard, a Mil-Spec A3 upper receiver, and a specially designed gas block intended to reduce blowback and cycle rates. The bolt carrier assembly and charging handle are not included.

Key Specifications

• The chambering is .300 AAC Blackout.
• The suppressor is pinned and welded to the barrel.
• The suppressor construction uses 17-4 PH stainless steel with a Cobalt-6 blast baffle.
• The stated sound rating is 127 decibels for .300 BLK subsonic ammunition.
• The system is full-auto rated.
• The suppressor diameter measures 1.5625 inches.
• The handguard is a 9-inch MR7 M-LOK model.
• The upper receiver is a flat-top A3 assembly.
• The gas system includes a low-profile suppressor gas block and black-plated gas tube.
• The package does not include a bolt carrier assembly or charging handle.

This configuration brings together the Resonator suppressor assembly and a purpose-built .300 AAC Blackout upper with compatible support components. Its integrated design, M-LOK handguard, and suppressor-focused gas system provide a streamlined platform for users selecting an NFA-regulated upper receiver group.