One up the marauder in 40. The rail is IDPA legal - I had a friend just talking to Chuck at Shooters Connection about this. The gun is also a limited run. They built it specially for SC. It was meant to be able to be use in Three events, USPSA, Three Gun and IDPA.
I beleive the measurement on the rail is 2.75 which is 1/2 inch shorter than allow so you have plenty of room.
The gun already comes with a 100 fiber optic front s you are good and also with a Tactical magwell. You may want to replace the magrelease button ( But not needed) I just like one that is filed so your thumb does not slip.
I run a STI Eagle in IDPA
13lb recoil spring
180 grain Extreme HP
4.0 grain of HP38
1.145 AOL
Produces - 133PF
Shoots very accurate and no recoil.
Bridgeville RIFLE and Pistol Club IDPA Assistant MD