Could be.
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the challenge will be finding an ar to do it on after everyone has handed them all in plus I bet after all this is done if you all of a sudden appeared with one in any configuration youd get it taken off you anyway wouldn't it be easier to get yourself a howa mini
youd probably warp the shit out of the lower as well
Yes, they work well. Used them to weld up a frame for a new fuel tank on the lawnmower.
https://www.youtube.com/watch?v=n1njyuPBIH0
The stuff is quite hard.
Stick the lower in water and tig a plate over the bottom of the reciever with a five round mag in it.
Its been done many a times, I'm sure. The problem with projects like this is cost. It takes time to do projects like this with lots of R&D involved. Time is money and very few customers are willing to pick up the bill. Normally if something like this is build its done by a friend with time on his hands.
I once worked with a young smith that changed a enfield so it will fire 45 ACP. Lots and lots of manufacturing.
Nothing stopping you from making friends with a hardy good fellow that owns the right tools?
I would rather invest my money in a Howa mini in 7.62x39?