Looking at the sales of colts namley the sporters. They talk about raised mag wells and no sear blocks being rare. I know I sound DUM here but what the heck are they talking about? I have a pre ban colt target model and would like to see just what they are talking about THANKS !!!
Is the raised mag well where the lip rises up at the bottom of the mag well? any one have links to pix which will help me?

The raised fence will be a raised border around three sides of the mag button.

The Sear block is a block that sits on top of the rear shelf, and can identified by a large hole/pin that would be at the same location as a auto sear(one side only), when the upper/lower is mated.  When looking at the open lower, the block stick up past the top of the receiver at the rear of the receiver.

Sorry, But I don't have a photo of the two.

Thanks for the info!