Shipbucket

This vessel carries a modern 20mm (?) gun. Picture is taken between mid 1950s (likely).
Its a former KFK into service as a guard ship in the Federal Germany Navy.
Anyone around who is familiair with this gun, or can ID it, and tell me what type?
Would be great)

That looks a lot larger than a 20mm, also note that there appears to
be a breech at the back end of the gun, indicating that it would fire
a single, hand loaded shell, and then need to be reloaded (also by
hand). It bears a strong resemblance to the Oto - Melara 3 inch gun,
which is now being built in an automated turret, but the gun by itself
looks very similar.

I don't think that this ship would have sustained a 76mm firing in that position.
I'm fairly sure that's an early 20mm S-20 Marinelafette.

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Worklist, FD scale submarines and ships :
- Project 971 "Akula" (80%)
- Project 705 "Alpha" (10%)
- Project 371 (70%)
- Project 1459 (30%)
- Projekt 151 Sassnitz (To be redone)

signal and Cplnew83, if you think the guns you have chosen are correct, please find a photo or drawing of the gun that can be checked against the gun in Alex's photo. Confirm or deny.

It's too early for the S-20, that didn't enter service until the 1970ies

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Source Materiel is always welcome.

let me throw out 35-40 mm in air. for it is exactly what it looks like to me.

Looking at it, it looks like a German 5 CM submarine gun.

Due to the bridge-wing style (postwar rounded wings) + radars, picture likely taken during 1960s-early 1970s (after probable late 1950's-early 1960s refit)
I concur, maybe a 20 mm/65 Rh202 prototype ?

I don't think its a 76mm, no way is that barrel long or fat enough to be a 3in. It looks more like a 40-30mm calibre range gun and mount to me.
The mount seems familiar though but can't exactly place it.

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The early Rh-202 (20mm/65) is more possible, actually with a close look the cannon on the KFK seem very similar with that on photo posted by Colombamike.

and Rheinmetall Rh 202