Ah, yes, the Remington Model 51
Glad you mentioned that one, Brian Williams.
The M51 is another really sweet design that cries out to be modernized and reintroduced. Truly streamlined, and with one of the most comfortable handle-to-barrel angles ever. I really don't see the reason for the overcomplicated lockup system in a .380 (or especially .32) ACP - - I believe it could be produced with either an alloy or polymer frame in a straight blowback in .380, or with a locked breech in 9x19mm. Nifty!
Best,
Johnny