I don't think it saw combat-- then I guess the D.510 didn't either, that I'm aware of. I put the D 510 in just to round out the numbers-- it did at least see squadron service, whereas I don't believe the M.20 did. I think the D 510 was a good contemporary for the P-26. I would like to see a good comparative analysis of those two-- would have been neat if they had seen combat against each other in some backwater.