Ohio ordnance has 1928 water-cooled bolts on sale today. The email says they will fit the 1917a1 and 1919a4. Is the extractor, and other parts interchangeable?
Yep, what he ^^^ said.... They use a different drive rod set up. The 1928 uses a captive spring/rod combo that hooks in a hole in the RSP and is locked in when the backplate is installed. I do not think a 1919 type rod will lock in a 1928 bolt. There are no notches for it to lock into.
really that's what I was wanting to know. Even if the bolt itself can't be used, I was wondering about if the extractor, firing pin, sear spring, drive spring etc would work.But it still means you can get an extractor for $99.00
I seen the same thing. My solution was sell the plate and then make my own....
The guide spring hole location was off on the plate, I had to enlarge the hole slightly and grind down the rear of the guide spring to create enough slop to allow the bolt to travel all the way back without binding. Had I noticed this before constructing the box I might have tried to fix the hole.