I have a couple of Centurion Arms rifles, one is 11.5 with a 10" C4 quad rail, and the other is a 14.5 with a 12" C4 quad rail. I really like these rails. Very solid, very stout, and very well finished. No mistaking the quality of these rails. If I'm buying another CA upper, I'm probably going to go with another C4 quad rail, even though CA offers a plethora of rail choices.
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