Once I picked up some 15 round 1911 mags...still have them. Work great.
the 8 rounders are from colt and fit flush with my bone stock 1943 Remington Rand. I had though only 7 rounders fit flush but these hold 8 and work first time every time.
there are 40 round drum mags for the 1911....I don’t think the son of Mario will allow those....