I purchased 5 chokes for my k20, 1would screw in. Not to go into all the BS in dealing with them the girl told me that jim sends out lapping compound with the chokes. I shipped mine back without trying to lap them in my k20. Good luck to those of you who buy them!!!!!!!!!
The light weight chokes are good, use them in my 391, easy to clean & vaporize targets if I do my thing; also screw in without any need for a tool to tighten
Not worth the money. My Trulock chokes patterned just as good at half the price. You can find lots of Muller chokes for sale used. Wonder why?
I was never enamored with them, tried a pair in my K80 (luckily a friend just loaned me a set to try) and they didn’t break targets nearly as well as my factory Titanium chokes. Not worth the asking price if you ask me, but then there are a lot of people (sporting clays shooters) that swear by them.