Some where I saw the before weight and the after weight of the receiver. I "believe" I remember 50 lbs before and 14 when done. Remember the floor scrap, millings could be melted and recast again. But YES what an amount of cutting. There was/is a company that was making bm59 receivers to replace the cut up ones that came in the kits.
Received a few Bren Tripod parts from BRP today and after I got home had a few minutes to clean and work with them. Happy to say I almost have everything that I need to get the Tripods to the stage that I want them at. Then after the gunshow, the following weekend I hope to start welding up a Bren receiver. At least that's what I'm planning at this time. Good Luck with your build.

Later 42rocker