Wont sya who, but he can chime in if he wants.....
the 1400 tube can be modded a bit to accept 13xx internals and breech. Pump stroke twice as long as a 13xx (you will need to use the 1400 pump linkage), so 10 stroke on it is like 20 on a 13xx.
Uses standard Crosamn breeche, barrel etc.
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