mikee Posted September 4, 2010 Report Share Posted September 4, 2010 How tight should the bush at the back of my T8 be, should it be clear of the barrel or should it touch mikee Quote Link to comment Share on other sites More sharing options...
Paddy Galore! Posted September 4, 2010 Report Share Posted September 4, 2010 not sure mate, mine touches ever so slightly, others can rub a bit, are they supposed to be fettled to fit? If it's tight then i'd try to skim it. Quote Link to comment Share on other sites More sharing options...
6br Posted September 5, 2010 Report Share Posted September 5, 2010 they should be a slight clearance of 1 to 4 thou so it won't rub the blue off. having said that some might shoot better with the bushing tight on the barrel. Quote Link to comment Share on other sites More sharing options...
jay222 Posted September 5, 2010 Report Share Posted September 5, 2010 the mod on my .223 has a tight fitting bush Quote Link to comment Share on other sites More sharing options...
CZ550Kevlar Posted September 5, 2010 Report Share Posted September 5, 2010 The bush at the back is basically an extention of the thread and provides some ridgidity and stops flexing etc, you want it tight but not so tight it wedges itself on the barrel when you screw the moderator on, I have a T8-AR and the bush i got supplied fitted nicely onto my mini-14 then i bought a CZ527 and the bush nearly wedged itself onto the barrel as it was more tapered, i just got my dremmel out and skimmed abit off the edge to make a tight fit that slipped off when the mod was unscrewed. Quote Link to comment Share on other sites More sharing options...
mikee Posted September 5, 2010 Author Report Share Posted September 5, 2010 The bush on the back of the mod was so tight that i couldn't fully screw it on, it was scraping the blue of the barrel, I thought I'd try with a few thou clearance so this afternoon got some emery paper wrapped around a piece of dowel in a battery drill and opened the bush out until it fully screwed on with enough clearance so I could just slide 1 thickness of glossy magazine paper between the bush and barrel, The rifle was spot on before i did all this and when i just checked zero it was shooting about 12" left and 18" low, so now re-zeroed to shoot 1" high at 100yds, shot a 3/4" 4 shot group, so its shooting better than i think it ever has mikee Quote Link to comment Share on other sites More sharing options...
Redgum Posted September 5, 2010 Report Share Posted September 5, 2010 There should be a slight tolerance to allow for barrel expansion when its hot according to my gunsmith. When my Remmie 700 was 24inchs long the mod was tight before it got to the thread and then it loosened up a bit further on, I thought is was a little slack but it had to be like this to get over the unevenness of the barrel. I had it chopped down to 20inches and the mod fits perfectly,just a slight interferance fit. Quote Link to comment Share on other sites More sharing options...
Elby Posted September 5, 2010 Report Share Posted September 5, 2010 How tight should the bush at the back of my T8 be, should it be clear of the barrel or should it touch mikee If you unturn it 1/4 of a turn you should have play in it Quote Link to comment Share on other sites More sharing options...
mikee Posted September 5, 2010 Author Report Share Posted September 5, 2010 its a few though clear of the barrel when fully tight, it shoots well so I shall leave it for now mikee Quote Link to comment Share on other sites More sharing options...
magman Posted September 5, 2010 Report Share Posted September 5, 2010 Should be clear of the barrel so yes leave well alone Quote Link to comment Share on other sites More sharing options...
Dekers Posted September 5, 2010 Report Share Posted September 5, 2010 Too tight is not good, if your barrel is not cut perfectly concentrically and the bush is tight, there is the possibility of moderator cant when the barrel gets hot, this will effect POI, you need an air gap. I don't know if there is any specified gap, never heard of a figure, but it will be small, perhaps a couple of thou! Too big is not doing you any favours either, the idea of the bush is a little added bracing in the event of knocks, bumps etc to the mod! Over barrel mods also get hot and retain heat (so does the area of barrel they cover), so I guess there is a very small argument to say too tight keeps the heat in longer as well, not good! ATB! Quote Link to comment Share on other sites More sharing options...
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