OK, the 28 ga. Repro BTFE iron measures 5 10/32" overall length and the 28 ga. Repro splinter iron measures 4 28/32" so, they can't be swapped without some modifications to the wood. Both irons seem to have the same taper in thickness but, of course, the BTFE becomes thicker due to the fact that beyond the recess for the forend loop it needs to be thicker to allow for the threaded hole to receive the reinforcing rod.
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