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https://www.theexplora.com/elegant-westley-richards-detachable-barrel-magazine-rifle-in-450-rigby/ Matt. |
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It looks like they used square thread profile. I'd like to see the latch mechanism in the forend and the joint plates. Beautiful rifle. |
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Tinker, it will be either an ACME or a Trapezoidal thread. Never a square thread. For a square thread it must have side clearance and therefore it would have end float. Matt. |