I built a lower on a manual machine. I've done a lot of the programming for a lower and other aluminum machining, that's what I'm basing my cut time estimates on. I was assuming production tools with high feed rates would be used on a machine optimized for aluminum.Have you ever actually made an AR lower or produced a complete barrel from a blank? I've watched it being done and can tell you it takes a lot longer than what you posted. Also your post supposes said company has a quarter million plus invested in machinery to do the work. No company in Canada is going to invest that much into a rifle they will sell a few thousand of at most.
If it is so easy why not produce one for yourself? I'm sure it would be an enlightening experience for everyone.
For barrel turning, I'm just guessing at times. I'm looking at how long it takes to machine a 14" long stainless round bar, and extrapolating from that. Not really that much to take off to contour a barrel, the way I see it. I never said it was exact, just a guess. I was mostly ball parking and pulling numbers out of my ass.
I am currently building a rifle, not for sale though.
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