This Compact 1911's frame is made of aluminum, thus maing it 26.5 ounces, lighter than steel frame. It is chambered for 9mm, .38 Super, and .45 ACP
Trigger is 3.5 to 4.5 pounds and can shoot 1.5 inch groups at 25 yards.
Link:
http://www.wilsoncombat.com/ultralight-carry-compact/
Price: $3650
From: Wilson Combat