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Hi Marc and welcome. Crush Washer, yes. Weight of 2.42oz w/Crush washer. Goes on right hand twist. Cheers and stay safe!

Hi Marc, the concave side of the crush washer goes toward the muzzle device (compensator, in this case). Video here , start watching an 0:55 >>> https://www.youtube.com/watch?v=eJzQPxFEw9s Stay safe & have a great day!