All of my usual places are sold out too. The after market ones needed to be fitted slightly too. They dont answer emails ofter but maybe Frontline Militaria can produce some new ones if asked.
Checking headspace and the locking mechanism is easy on these. I have built many of these with mismatched parts and new parts. All of them have proper headspacing and the locking lugs work flawlessly.
It can be bent back into place BUT it has to be done by someone who is knowledgeable in heat treating metal since you are going to need to maintain the proper hardening or you will have a fail point. With how most "gunsmiths" are mostly parts assemblers now. good luck finding someone that can...
I have had a few builds with this issue on the gas block and front sight. You have to find a slightly bigger pin and possibly slightly open the hole bigger on the block or front sight depending on the size of pin that you get. It MUST be tight and not move at all!!
You will have to do A LOT of work to get the repros to feed right. The lips on the top are shaped different, you will have fit each one slightly to get them to even be able to clip in and the springs are too weak. I have a few of them but would rather spend the money on a real one even if beat...
I think you are still OK with the hardening. I think you could use a small grinder and take small passes at it and eventually you can clean it up. When I say small passes, just enough to take off some metal but not enough to heat up the whole piece. A little patience and you will get it flush...
It has potential. If you are good at welding you may be able to fill this holes in and not look too bad. It wouldn't be too difficult to drill and tap that bolt handle hole either. I think it is savable if you go slow on it and don't rush your work. As stated, you would need to heat treat it...