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post #1 of 4 (permalink) Old 11-10-2009, 08:43 PM Thread Starter
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thread size for green mountain?

does anyone know what size the thread is for a green mountain 15/16 fast twist breech plug ?I am wanting to change from percussion to flint ignition ,the 2 choises I have is 11/16x20 thread or 5/8x18 thread any advice would be priceless
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post #2 of 4 (permalink) Old 11-10-2009, 09:20 PM
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Re: thread size for green mountain?

I would check out this site for a response and an accurate answer. Not that HPA is not good for ML stuff - but this traditional sit is better http://www.muzzleloadingforum.com/fusionbb/index.php

Good night Chesty, wherever you are......
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post #3 of 4 (permalink) Old 11-10-2009, 09:58 PM
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Re: thread size for green mountain?

I would call Green Mountain Barrels and ask them. Maybe Track of the Wolf would know. I know they have replacement breech plugs and I think there is a slight difference in length for the flint and cap plugs. Something to consider perhaps to get the vent and pan to line up. I don't know if the lock mortices are the same for flint and cap locks either.

I am going to guess but I bet it's 5/8 x 18 but it could be either. Pretty sure I remember the fast twist blanks on GM website being 5/8 x 18. I would call Track and get the plug there if they knew for sure.
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post #4 of 4 (permalink) Old 11-12-2009, 10:21 PM Thread Starter
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Re: thread size for green mountain?

mossie was right 5/8 x18 for anyone who wants to know
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