The Griffin Dual-Lok HRT-556 G2 suppressor in black (Griffin part no. GADLHRT5-W) is the shortest member of the DUAL-LOK family, a 6.3-inch 5.56mm rifle can that Griffin first designed for elite HRT units. The G2 revision pairs an improved low-profile flash hider end cap with a redesigned ECO-FLOW baffle stack and a thicker blast baffle, which lowers gas backpressure, helps the host rifle cycle and adds durability over the original G1. Griffin Armament lists it as a hard-use, low backpressure rifle and tactical suppressor. It fits short-barreled carbines and duty rifles where length matters.

Key Specifications

• The caliber rating is 5.56mm (.22 caliber), the cartridge this suppressor is built for.
• The overall length is 6.3 inches, the shortest in the DUAL-LOK family, which keeps a short-barreled rifle manageable.
• The diameter is 1.5 inches, a size that keeps the profile compact on a carbine.
• The construction is 17-4 H900 stainless steel and 718 Inconel, materials chosen for heat and hard use.
• The mount is DUAL-LOK, a wear-free system that needs no consumable parts and uses an ACME thread for fast attachment.
• The suppressor is full-auto rated, which signals durability for sustained fire.
• A DUAL-LOK Minimalist Brake (5.56mm) is included, so the muzzle device that mounts the suppressor comes in the box.

Frequently Asked Questions

Do I need ATF approval to buy this? No. As of October 9, 2026, ATF no longer requires Form 4 approval, registration or a tax stamp for suppressors. It transfers on a Form 4473 with a background check through a Class 3 (SOT) dealer. State and local laws still apply.

How loud is it? Griffin rates the G2 at -34.20 dB (135.60 dB on an 11.5-inch Griffin MK1) and -36.73 dB (134.01 dB on a 16-inch Griffin MK1).

Which DUAL-LOK muzzle devices will not work with it? Griffin states this suppressor is not compatible with the DUAL-LOK Stealth Flash Suppressor (2.75-inch) or the DUAL-LOK Bayonet Flash Hider. It accepts other DUAL-LOK devices such as the Minimalist Brake, Minimalist Flash Suppressor, 2 Port Paladin Brake, Tactical Compensator and the 2.25-inch Stealth Flash Suppressor.

Buy the Griffin Armament Dual-Lok HRT-556 G2 Suppressor, 5.56mm, Black

As of October 9, 2026, this suppressor transfers on a Form 4473 with a background check at your Class 3 (SOT) dealer, with no Form 4 or tax stamp; state and local laws still apply. Order through Griffin Armament‘s suppressor lineup and our Lubbock, Texas team will handle the transfer and it ships fast to your Class 3 dealer.