There is a cheat you can do, buy the steel tyga flanges and weld them onto the chambers.

It worked like a charm for me on stock chambers and aftermarket CF silencers.

It also gives you a chance to respray the chambers and change out the o-rings while you are at it.

IF YOU HAVE A DRILL PRESS YOU CAN ALSO PUNCH OUT THE WASHERS ON THE CHAMBERS TO BE PROPER SIZE.