Back in the 60's or 70's the Russian trap shooters came to the olympics with a secret weapon, they had a 'new' choke methodology. They were using the jug choke which had been invented as a way of giving muzzleloaders chokes without making loading from the muzzle, impossible. It's a fairly simple process and is easier than sleeving. I can also vouch for Mike Orlen. I've dealt with him in the past and found him an impeccable smith and a gentleman to boot.