Hey,
I'm working on a trade deal and I'm trying to figure out whether the KAC M4 RAS (not RIS - that's what the trade's for

) will fit on a J&T HBAR M4 barrel or not?
I know that the RAS is a little more sensitive to barrel profiles than the RIS, but will fit on some heavier barrels - like the RO921HB profile, but I haven't got a J&T barrel to test it out - anyone got the combination and know, or check whether or not it works?
Thanks,
~Augee