Hi Claudio, nice kit and a nice reference photo. Will you be trying to do it as the photo after it had been captured ? Will be following along as you build it
I believe 331 is serial number 305020 currently preserved in the USA. I understand the gun on this particular vehicle is jammed in the fully recoiled position as it was when captured, which has led to some kits which have been based on this example having short barrels (and even short after-market turned barrels!). It may well be worth investigating further as if this new kit has a corrected barrel length it will be too long for a post-capture depiction…