The Knight’s Armament 5.56 CRS-2 suppressor kit in flat dark earth pairs the full-sized Combat Rifle Suppressor with a QDC flash hider for 5.56 NATO rifles. Knight’s Armament designed it to virtually eliminate flash and system backpressure, using Pressure Reduction Technology that pushes gases forward and away from the shooter. The Quick Detach Coupling keeps point of impact shift minimal and consistent. It is a durable can for AR-15 builds where flash and gas matter.

Key Specifications

• Overall length is 6.0 inches, the full length of the can from end to end.
• It adds 5.4 inches to a bare muzzle, which is the figure to use when planning barrel and handguard clearance.
• Weight is 15 ounces, light for a full-sized rifle suppressor.
• The mount is the Quick Detach Coupling (QDC), compatible with 5.56mm Knight’s Armament QDC muzzle devices.
• Knight’s Armament measured 136 dBA at the ear and 143 dBA at 1 meter left on a 14.5-inch barrel with the 3-prong QDC flash hider and M855 ammunition.

Frequently Asked Questions

What does the kit include? The kit pairs the CRS-2 suppressor in flat dark earth with a QDC flash hider.

Does it affect gas and flash? Knight’s Armament says Pressure Reduction Technology minimizes back pressure and pushes gases forward, and its test showed 1.15 mcd*s of first-round flash and 0.1 mcd*s on the second round.

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.

Buy the Knight’s Armament 5.56 CRS-2 Suppressor with QDC Flash Hider, FDE

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 Knight’s Armament’s suppressor lineup and our Lubbock, Texas team will handle the transfer, and it ships fast to your Class 3 dealer.