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Author: Subject:  Fitting 90.5s after 92s
Memberbronte17
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posted on February 20th, 2019 at 08:32 PM
Fitting 90.5s after 92s


Hi Guys

Hoping someone can advise. I currently have 92s and thinking about a new combo with 90.5s. Is it possible to go back in size? Thanks for the info

Cheers
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posted on February 21st, 2019 at 06:55 AM



I think you would have to make a spacer ring to fit to the lower section of the barrell so it wont cock when installed in the case

I would be measuring up the 2 barrels first




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posted on February 21st, 2019 at 07:03 AM



You should check but Im pretty sure they are the same external size
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posted on February 21st, 2019 at 11:13 AM



Gene Berg has some information buried in his web site under the "Labour" section?
My understanding is that 90.5 and 92 use the same case and head sizes.
96mm Case & 98mm head, so the 92s have thinner sealing surface & skirt, which is why people use 90.5mm
Gene says to maintain the original barrel clearances between case & head.
Says stock case has .012" to .020" clearance, doesn't say what the stock head clearance is.
http://www.geneberg.com/cat.php?cPath=2990 
Some good stuff on that site.
Cheers
Tony




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posted on February 21st, 2019 at 07:42 PM



They could be thick wall ninety twos

If so, ninety fours would fit




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