I hope this sort of post is allowed here. I’ve been working on this but I’m not very knowledgeable on guns so I’m not super sure of my guesses. Specifically I’m trying to work out what sort of ammunition each uses, but the type/model of gun would help too.
Edit: I think my image did not upload. I uploaded it to Postimg here: https://i.postimg.cc/0QW3mRbM/230425234656.jpg
Based on that info, I wouldn’t be surprised if #4 is the Pindad P1. Just seeing the front/top, I could easily confuse a 1911 and a Hi-Power… or even a Tokarev maybe. But, it looks like they do have 1911’s listed on that page too so it’s a toss up from me.
And I think you’re right on the Pindad - especially the SS2 for #5. Gas block/front sight, receiver, stock and caliber all match. I’d never heard of these - nice find!
I’m a tiny bit proud of guessing that it was piston operated based on the gas block : D