In my opinion) I would recommend getting a full metal kit for your current tm and getting a gun doctor to put the lower receiver in. I'm speaking for myself on this, but the lower receiver on a 1911 has more tiny bits than a full length gbbr. Watch some do it yourself videos on youtube first if you think you can do it, but if you are not familiar with it I would just get someone else to do it. The upper slide part of the gun is easy as pie.
__________________
|