YHM S.U.R.G. — Suppressed Upper Receiver Group
The YHM S.U.R.G. (Suppressed Upper Receiver Group) is an integrally suppressed upper receiver available in two configurations: a Turbo suppressor on a 5.56mm barrel and a Resonator suppressor on a .300 BLK barrel. In both cases the suppressor is permanently pinned and welded to the barrel, bringing the combined barrel/suppressor length to just over 16" — requiring only a single NFA tax stamp. Each upper includes a lightweight M-LOK handguard, YHM Mil-Spec A3 upper receiver, and a specially designed low-blowback gas block. Does not include bolt carrier assembly or charging handle.
Turbo S.U.R.G. — 5.56mm
Caliber | 5.56 NATO |
Barrel Length | 10.5" (suppressor pinned & welded to 16"+ combined OAL) |
Overall Length | 23.5" |
Diameter | 1.375" |
Weight | 3.6 lbs |
Suppressor Material | 17-4 PH Stainless Steel / Cobalt 6 blast baffle |
Handguard | MR7 M-LOK |
Upper Receiver | YHM Mil-Spec Flat Top A3 |
Gas Tube | Black Plated, Carbine Length |
Full Auto Rated | Yes |
Tax Stamps Required | 1 (suppressor only — no SBR stamp required) |
Resonator S.U.R.G. — .300 BLK
Caliber | .300 AAC Blackout |
Barrel Length | 9.1" (suppressor pinned & welded to 16"+ combined OAL) |
Overall Length | 23.5" |
Diameter | 1.5625" |
Weight | 3.3 lbs |
Suppression Level | 127 dB (.300 BLK subsonic) |
Suppressor Material | 17-4 PH Stainless Steel / Cobalt 6 blast baffle |
Handguard | MR7 M-LOK 9" |
Upper Receiver | YHM Mil-Spec Flat Top A3 |
Gas Tube | Black Plated |
Full Auto Rated | Yes |
Tax Stamps Required | 1 (suppressor only — no SBR stamp required) |
Key Features
One tax stamp — pinned and welded configuration means no SBR registration required
Drop-in ready: includes handguard, upper receiver, gas block, and gas tube — just add BCG and charging handle
Specially designed low-blowback gas block reduces cyclic rate and backpressure
Available in 5.56 NATO (Turbo suppressor) and .300 BLK (Resonator suppressor)
M-LOK handguard for lightweight and accessory flexibility
Full-auto rated; made in the USA with a lifetime warranty