Apparently, the square shaft was Pedersoli's fix for the the inherent problem found on their "early" guns, and all H&Rs. I know nothing of Ubertis.
The source of the problem was H&R's belief that they could lower the cost of manufacture by eliminating the breechblock cap and the recess for it in the breechblock. This could be accomplished by separating the latch and shaft, which would have been all well and good if done so as to NOT permit relative rotation between the parts. That is where they slipped up, and Pedersoli's fix is effective.
As an aside, H&R purchased original M1873 sights for their limited-production Infantry Rifle commemoratives. Sometimes I wonder if they might not have done well to do the same for the blocks. Ironically, their lawyers would probably have rejected such an idea on liability grounds, little realizing that their own bean-counters were perpetrating a worse sin in-house.
The source of the problem was H&R's belief that they could lower the cost of manufacture by eliminating the breechblock cap and the recess for it in the breechblock. This could be accomplished by separating the latch and shaft, which would have been all well and good if done so as to NOT permit relative rotation between the parts. That is where they slipped up, and Pedersoli's fix is effective.
As an aside, H&R purchased original M1873 sights for their limited-production Infantry Rifle commemoratives. Sometimes I wonder if they might not have done well to do the same for the blocks. Ironically, their lawyers would probably have rejected such an idea on liability grounds, little realizing that their own bean-counters were perpetrating a worse sin in-house.


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