old-school colt commercial firing pins have oversized end rings, but they don't do that anymore. i don't know whether the commercial firing pins work in standard carriers- i've never heard that they don't, but that doesn't mean it aint so.
thats kind of a rare thing, especially now that colt has finally ended their decades of deliberate compatibility issues.
they're all free floating.. chamber a round, pull it out, and look at your primer.
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