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Mod 3 is LgI put one of these on one of my ARs that has a scope on it. The scope made it hard to grab the standard handle with two fingers. I can pull this handle with one finger, and it is very smooth.
I do not know if this is medium or large, I just know that it works great.
Amazon.com: Bcm Charging Hndl 5.56Mm/223 Mod3 Bk: Sports & Outdoors
Mod 3 is Lg
Mod 4 is Med
Mod 5 is Small