Re: LES P18 9mm
The Steyr parts might fit, but I'd definitely keep that P-18 as stock as possible. It's a very low-production firearm and would be an interesting collector piece to the right person.
I don't have any info on serial numbers for them though...I just have a limited trivia-type interest in the Rogak because of it's relation to the Steyr GB. My uncle has a GB and while I'm not a big fan of the "wonder-nine" type pistol (high-capacity double-action autoloaders that is) I really do enjoy taking his GB out for a few rounds whenever we go shooting together.
One P-18 that I've seen had a 24xx range serial number, the other I don't remember.
Morton Grove, Illinois is a suburb of Chicago...north of metropolitan Chicago and just northeast of Chicago's O'Hare airport.
It gained notoriety in 1981 for it's ban on handgun ownership...which is pretty close to the time that Rogak was forced via lawsuit from Steyr to discontinue production of the P-18 pistol that you've got.
That sort of makes a "hat-trick" (Excuse the hockey pun. 3 points...the lawsuit, the handgun ban, and the low production) to make your P-18 a collectible.