John... I'm a Buckmark fan, but then, I've always peed against the wind!
I've not handled the Umarex/Colts, and I understand Grouse's comment that the complete guns simply weren't available. Given the propensity of people like us to play with our guns..... I'd assume that someone is going to buy the GSG, replace the MSH, trigger, sear, and whatever else they can.... and could come very close to what their 1911 is set up for. I dunno.... I'm just a workin' stiff.
(chuckling)...
Now... the comment about using your own frame has a LOT of merit, if your doing serious training and can't afford .45 ammo.
Da