FWIW the H3 is slightly lighter than the RRA 9mm 2-piece buffer. I've run the RRA in my 16" carbine-length gas system for over 17 years on various loads (Wolf steel cased 223, up to 77gr SMK OTM, XM193, M193, M855.XM855) with and without a suppressor without issues. I went the RRA route back in the day because of issues extracting Wolf steel cased ammo. Someone suggested a heavier buffer and I just kept it in there to this day.