My 712. I picked it up for under $400. I added the Nordic tube, Truglo Magnum Gobbler fiber optics sight set. They clamp on rock solid to the vent rib and are adjustab le. I tried a Briley extended choke that I had on my M1. I shot it for a while and noticed it kept working loose. I had a hard time getting it out because the threaded end was all messed up. I put the CZ modified back in and haven't had a problem. I cut about 1 1/4 off the buttstock, modified the grey insert and installed a limbsaver. The shorter stock made a huge difference on the feel of the gun and the soft pad was kinda nice too. I haven't drilled the ports or changed the springs. So far it shoots all the birdshot i've tried. Still working on slugs. I plan on opening up the load port and welding the lifter. Is there a trick to getting the bolt handle out? mine won't budge. Once I get it out, i'm going to modify it. So far a great gun and has gone from a backup/experiment gun, to maybe moving my trusty M1 to a backup role.