I don't believe the Shiloh requires a modification.
After considerable use, the block begins to leak gas and accuracy decreases. This requires a repair/replacement of the breech face plate which Shiloh fits to your gun. There is no actual modification of the parts shape or how they work. Shiloh is making the replacements from a different steel to reduce the likelihood of erosion that causes this leakage. If that is what you mean by modification, you are right.
Edwin Flint
14th Mississippi Infantry, N-SSA
Deputy Commander, DS Region
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