Crush washer made in Czech Republic. Size of 13mm (1/2") or 16mm (5/8").
It helps with instalation and timing of your muzzle device. It will work with majority of muzzle devices.
Recommended minimum barrel OD is 15mm and muzzle device minimum OD is 20mm for 13mm (1/2") washer or minimum barrel OD is 18mm and muzzle device minimum OD is 22mm for 16mm (5/8") washer .
Following these requirements we can guarantee reliable function of the crush washer.
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