Since you plan on suppressing it I presume you don’t want a cutout with rail forward like the RIS II.
Here are the only two I am aware of. The C4 you know about, but maybe not the no longer listed 9.5 FSB Lite Rail. It’s slightly slimmer and a hair taller than the Centurion. Actual length of the DD is 9 7/8”. Might be a lot harder to find than the 9.5” C4. Mine is circa 2012.
“ When I comes to modern politics, I think the inverse of Hanlon's Razor applies...In other words, "Never attribute to stupidity that which is adequately explained by malice." - Kerplode
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