Ditto to what popeye said also they don't seem to be the most reliable I good friend of mine though they were neat and order a Bul race gun , a 5',and a commander size. none of the three would run very well quite jam prone.
They are almost identical to the poly kimber. Bul makes kimber poly frames kimber makes Bul slides.
The poly Kimber seem to hit or miss in the reliabitly department also, most of the steel kimbers I have shot and sold run flawlessly
I don't carry poly kimbers or Buls had to send almost all of them back they wouldn't even feed ball reliably
Unless you are sold on the poly concept I would go with a para for a high cap 1911.
NOTE i'm sure there are some Poly kimbers and Buls out there that run great , just not the 6 guns I have experience with.
So please don't flame me