I'm on the same boat here, looking to get a threaded outer barrel for my TM1911 series 70. From what I hear, when using a silencer it is good idea to use a fixed type barrel, rather then a standard tilting barrel because the increased weight at the front can cause cycling problems.
I've found this:
http://shop.ehobbyasia.com/uac-stain...l#.Vjl4x4r8WSw
not a 1911 barrel but bull barrel for hicapa, looks to be my best bet so far, just wondering if this will work good in a TM1911 if I take out the bushing. Will it still be accurate even though I'm not using a standard barrel?