Dead Air Armament Sierra 5 KeyMo 5.56 NATO Suppressor Sierra5KM

This item is a CLASS III Firearm and must be shipped to a licensed dealer with a valid SOT in your state. Normally this item will ship within one week of receiving your dealer's FFL & SOT information.

This firearm requires that a $200 tax stamp be paid and an ATF Form 4 be filed after it arrives at your dealer. Current lead times for Form 4 approvals are 9 to 12 months.

If you do not fully understand the process of purchasing a Class III item please feel free to contact us via email.


Manufacturer: Dead Air Armament of Lawrenceville, GA

Model: Sierra 5 KeyMo

SKU: Sierra5KM

Includes: A 1/2-28 KeyMo Flash Hider and a KeyMo Adapter

Caliber Rating: 5.56 NATO, 224 Valkyrie

Energy Rating: 2200+ ft lbs

Bore Diameter: 5.56mm

Finish: Black Cerakote®

Length (No Adapter): 4.87"

Length (w/KeyMo): 6.27"

Diameter: 1.50"

Construction: Cobalt 6 Baffles, Stainless Steel

Weight (No Adapter): 10.8 oz

Weight (w/KeyMo): 15.4 oz


All items are factory new in box unless otherwise stated. Based on the information available to us, the above specifications describe this item to the best of our knowledge.  For further information, please contact or visit the manufacturer's website.