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Barrel markings

https://www.full-bore.co.uk/viewtopic.php?t=30328

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Barrel markings

Posted: Thu Apr 27, 2017 2:58 pm
by shugie
At some point my Swing has been refitted with a Border barrel marked non-standard with the following

GI.308
F.300
Z.3070

what do the F and Z figures denote?

Re: Barrel markings

Posted: Thu Apr 27, 2017 3:07 pm
by dromia
Bore and groove diameters?
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