I shot IPSC (w/Kimber single-stack .45) for quite a while but am currently on hiatus due to family commitments. However, the club just notified me there is a new class this year for single-stack 1911s - no rails, 8 rd. mag limit but ambi safeties, mag funnels, ext. grip safeties are o.k. This sounds like fun - single stackers were getting a bit outgunned on some stages by the plastic double stacks.