Front barrel band screw for Hatsan 44-10 Long

The barrel band screw on my AT44 QE tact is just a regular screw that can be replaced at Home Depot. Just take your barrel band with you and keep trying screws until one fits.

I have been having trouble with the main stock screw. I stripped it when trying to remove it and I had to replace it with another from my tool box until I could buy the right one. The one I use fits but it stops the air cylinder from fitting properly so I need to buy the right one at some point. I believe the main stock screw is not just a regular one but I could never find any info online.