wait, I thought the constrain here would be a barrel's length, not a turret's size ... note I said here (smaller hulls might have additional issues of 'top weight', 'magazine spaces', etc.) ... I now ate a beef stake with roasted potatoes LOL will try to check anyway
Barrel length won't be a constraint, but the size of the turret (and therefore top weight and bridge and possibly CIWS clearance) will definitely be a constraint. Besides, there is nothing wrong with using the 76mm gun for the 056/A and the 054A/B (and the 071), and using the 130mm gun for the 052C/D/E and the 055. Logistically both guns are widely used across the PLAN.
That A190 turret is certainly a lot smaller than the H/PJ38 turret. It just looks bigger due to the smaller size of the corvette. The Russians really do love to go full retar - I mean Russian, on their smaller ships.China could always go full Russian:
(have to go now)
Maybe. I'll have to locate a high res side shot of the 052D.
I just looked at some charts and I ballpark LOL at (in meters) five vertically times four times four
