I don't want to burst anybody's bubble, but, for the most part, the parts on the new SKB's are interchangeable with the old Ithaca SKB's. Like all O/U's, parts need to be more or less hand fitted to the individual gun.
I recently broke a top ejector on my Ithaca/SKB 700. After a call to Gun's Unlimited, I had a new ejector in days, and another couple of days for a gunsmith to fit it.
If you look at the schematics on the SKB website, you'll find that parts for the Ithaca/SKB 500, 600, and 700, and the SKB 500, 505, 585, 600, 605, 685, 785, and 885 are the same. The 85TSS has a couple of modified parts, but very few.
The SKB is a modification of an old Merkel design that hasn't changed much since the 60's.
Just found a model 600 28" at a local gun show for $350!!! Really!!
The guy told me it was a "skeet gun" (barrels marked full and impmod), also was told it was bored out to take 3" shells (forcing cones were lengthened and polished). Gun was probably 95% condition. Shot it yesterday (in a typical U.P. spring gale) and hit 22/25 (not bad for a strange gun).
I learned to shoot trap w/a century single from SKB. Wish I still had it, just for fun.
SKB's are good starter guns, and largely underrated.
Just purchased older skb w/ no identifying marks on top of barrel either side of very wide broadway vent rib. only proof marks are - left side of barrel by chamber: "M7IV" over "891" - right side: "SPR" over "SPR" - bottom of barrel: "K" then the serial number "708XXX" then "6" then "NP". The only markings on this o/u shotgun that identifies this firearm other than the actual way it was manufactured is the buttplate w/ " SKB " lettering on it. Nothing about Ithaca. The shotgun's entire receiver,trigger guard, and top end of barrels near the chambers is intricately & highly engraved by hand ( deep relief ). Can anyone help to identify what model ? Serial # on reciever is "CM708XXX" on bottom within the cavity made for it. Also I need to replace some of the trigger parts, the trigger itself w/ selector as well as bottom firing pin and bushing/retainer and possibly both sears..... how long did it take for skb Omaha to rebuild your shotgun? Thanks for any info. zoom.