Bangladesh FT-7 has a gun?

I’ve been looking more closely to some of the 6 newly-delivered F-7 and 2 FT-7 and I saw what I think to be a twin-barrel 23 mm gun (chinese copy of GSh-23) under the fuselage of the trainer version.
If so, this would really be a first for the MiG-21 family – to have a trainer with a gun incorporated rather than only attached in a pod.
What do you guys think, am I right or is it something else?