I was in Houston yesterday on business and stopped by a gunstore there just to look around. I found a combination Main Spring Housing/Magwell and a set of flat bottom grips as well for a 1911. I picked them up and last night took off the temporary magwell I had on. The temporary magwell, while well made, to me looked like a cheap add on. This one slid right in without any modification. It is an arched Main Spring Housing, and I usually prefer a flat housing, but this one feels good in my grip. I also like the way the grips also cover the Main Spring Housing Pin to give it a more finished look. Both items came out of Kimber packaging.