The full rail fits, but full set comes with a different height front post (taller iirc, can probably measure that) and I suspect a different rear sight as well.
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editing to protect the innocent. At this point do not think the Penn thunderheads are going to work with my rifle. They feed ok, and the AA#9 is super quite-but accuracy is non-existent at 100 yards. Given time, I will try them in other 357 rifles, and other bullets in this rifle.
I highly suspect that slugging the barrel will tell me the problem as the Thunderheads are soft .357 and not offered oversized.
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tried a quick and dirty slugging, but it was inconclusive. Shot some jacketed bullets today and was on target. Still need to tighten the group, but it was in the scoring rings at least. Shot 357's today, do have some 358's but those will need a bit more work-too much taper for a 357 case. Hope that a shorter 38 case will fit them better. They are definitely not in the reloading books, but I am not too worried as AA#9 is tolerant of low charges and not wistanding a detonation, sub's are not high pressure loads.