You shoot Single Stack Open?
I'm not so sure what a "non-tactical rail" is...but here's a full metal railed model: http://www.redwolfairsoft.com/redwolf/airsoft/Gas_Pistols_SMGs_WE_WE_1911_Tactical_Railed.htm
Here's a non-railed full metal version MEU (you can change the grips if you don't like the wrap-arounds : http://www.redwolfairsoft.com/redwolf/airsoft/Gas_Pistols_SMGs_WE_WE_MEU_Black_with_Pro_Grips.htm
These are not high quality, but they are the better of the full metal 1911's (single stack, that's not an A1 model).
Sadly, airsoft manufactures do not produce expensive high quality guns, hence the reason for "building" them.
They are all made of zinc alloy and/or plastic.
Here's the WE line up (if you prefer to buy from a USA retailer): http://www.airsoftpost.com/index.php?cPath=21_45_252
There are some others single stack 1911's listed ^ there, that have protruding, threaded barrels...you could always buy one and cut off the threaded portion. Or buy a replacement outer barrel.
Or you could always build an airsoft gun that cost more than a real Kimber.