OK Trapdoor fans, don't scream! This is a serious question: I would like to buy a Trapdoor, with the Buffington sight, as they quite simply outshoot most other military BP cartridge rifles, especially with aged eyeballs. But some competitions insist on open sights and do not permit rifles with Buffington sights to compete in the military class. The answer would be to buy a Buffington trapdoor and swap the backsight temporarily as needed. But this is only realistic if the swap is a simple screw off/screw on alteration.

So: do the two types of backsight have the same fixing hole spacing, or would the ramp backsight have to be altered to fit in place of the Buffington?
(I know that it doesn't work the other way around, because of the notch in the barrel band.)

For those who are worried by this idea: my rifles are tools, mostly hard-used tools, not museum showpieces.
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