I have a sistema colt that I would like to put  bolt on rear sights on, does anyone have any suggestions as to which ones to get. Thanks

What the hell is a bolt on rear sight? As far as I know the rear is a standard dovetail and the front is a stake on.

Bolt-on: A sight I can buy and install on the gun with out having to file out the dovetail a  larger size.

Brownells they have a bunch of replacement 1911 sights.

The front staked in sights have different widths, be sure which you have before you order.

If you just want the rear sight Chip McCormick make a good looking rear sight.

Aaahh!

Having recently shopped for such a beast on several recent projects, I can say you have a plethora of options. Just fish thru Brownell's.

I know Trijicon and Millett make sights for the factory dovetails.

I recently put the Nowlin tritium lowrider front and rear on my Springfield. I mailed the slide to the Nowlin's folks and they machined a front dovetail and installed the whole shebang. Had it back in a week. The rear fits in the factory dovetail. The McCormick lowrider is the same system without the tritium. The rear sight is way cool looking. Very sharp.

Thanks for the info.