Thegogg Posted July 24, 2016 Report Share Posted July 24, 2016 I've just bought a new Widcat Evolution moderator and need to have the end bush machined to fit my barrel so should it be a tight, no gap fit (which will leave marks on the barrel) or should it be a snug/loose fit? I'm thinking of going for the snug/loose fit so what gap should be left, is 1mm all round enough (17.5mm bush hole for a 15.5mm barrel)? Quote Link to comment Share on other sites More sharing options...
rodp Posted July 24, 2016 Report Share Posted July 24, 2016 I was reading a post about this the other day on another forum (I think) and the general consensus was to leave a small gap, about a quarter of a mill if I remember correctly. I checked my others and the gap varies from an air gap to a quite a bit of wobble when not tight. I'm going to machine my own and shall leave about a quarter a mil max, just enough to be loose when barrel's hot. Just found it, Spoke to the wildcat suppliers. Apparently there should be a small gap around the outside to allow for expansion of the barrel. The bloke I spoke to wasnt 100% sure on how much of a gap should be there but advised to leave the thickness of a piece of paper? Quote Link to comment Share on other sites More sharing options...
Thegogg Posted July 24, 2016 Author Report Share Posted July 24, 2016 I was reading a post about this the other day on another forum (I think) and the general consensus was to leave a small gap, about a quarter of a mill if I remember correctly. I checked my others and the gap varies from an air gap to a quite a bit of wobble when not tight. I'm going to machine my own and shall leave about a quarter a mil max, just enough to be loose when barrel's hot. Just found it, Spoke to the wildcat suppliers. Apparently there should be a small gap around the outside to allow for expansion of the barrel. The bloke I spoke to wasnt 100% sure on how much of a gap should be there but advised to leave the thickness of a piece of paper? Excellent, thanks for this. Quote Link to comment Share on other sites More sharing options...
steve_b_wales Posted July 24, 2016 Report Share Posted July 24, 2016 I placed a thin strip of tape where the moderator stops on the barrel. It will help eliminate any marks. Quote Link to comment Share on other sites More sharing options...
rodp Posted July 24, 2016 Report Share Posted July 24, 2016 I placed a thin strip of tape where the moderator stops on the barrel. It will help eliminate any marks. Think that's quite a popular thing, tape or heat shrink. With the one I have to do it's for the new .204, and it's going to be a wet weather rough gun so I couldn't give a monkeys whether it gets marked or not Quote Link to comment Share on other sites More sharing options...
CharlieT Posted July 24, 2016 Report Share Posted July 24, 2016 Reflex moderator fitting instructions state a gap of +0.02mm. Quote Link to comment Share on other sites More sharing options...
rodp Posted July 24, 2016 Report Share Posted July 24, 2016 Reflex moderator fitting instructions state a gap of +0.02mm. How thick's a piece of paper? Quote Link to comment Share on other sites More sharing options...
bullet1747 Posted July 24, 2016 Report Share Posted July 24, 2016 How thick's a piece of paper? Depends on how long the blonde bit has had it Quote Link to comment Share on other sites More sharing options...
rodp Posted July 24, 2016 Report Share Posted July 24, 2016 Depends on how long the blonde bit has had it Hey, there's some very clever blondes about, there's ... err.... 'ang on a bit... umm ......... wait a mo ....... err ............. no, I give up . Quote Link to comment Share on other sites More sharing options...
Jaymo Posted July 24, 2016 Report Share Posted July 24, 2016 Rods correct According to Alison from wildcat it's the width of a fag paper........ And that's how all of mine are Quote Link to comment Share on other sites More sharing options...
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