So I finally got the grenade tube removed, as well as the front sight base off. Note to anyone wanting to do this, I tried punches, drift punches, a hydraulic press with a punch block, and spent a good 8 hours at least on these pins. Finally had to take it to the drill mill and managed to drill one pin out cleanly. Even with a hole through the one pin it took another go with the drift punches to get it out, at least on my rifle it looks like they peened the pin on both ends. The other one wouldn’t move and I broke 3 bits trying to get it going, finally just had to use a very small end mill to cut into the FSB. Sacrilege I know but I’m sourcing an AK74/103 FSB with brake to attach to the front. I’ll have to upload some pics but honestly, it is an amazing amount of work to remove the FSB unless yours come out cleanly with a good punch and base.