Hello everyone, I hope all is well.
I have been trying to model the above subject and it's turning out to be
quite a challenge. I downloaded the references from blueprints.com
and i'm am using references from google to ensure I get the
right shape. The head of the gun has been quite tough to figure out.

Not sure where to start and how to put all the pieces together.
Any advise will be a great help!

Attached please my file and the images.

Cheers!
Sandeep.