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Made the absolute difference for me in timing on my AR-10 chambered in 6.5CM with RLGS+2" barrel using Norma 130gn Golden Target. With SCS H1 with Red/Blue spring and Brownell's Ti BCG it functioned fine but brass was a little dirty with light swipes. Upgrading to a H2 with this buffer weight helped but adding the Red/Green spring timed things perfectly and brass looks like it came out of a gas gun.
Tight fit on my .936" gas journal that is over 1" long. You need to be able to fit up your (3x) set screw holes but that is easy enough with any jig that sets the first hole if you have a vise and drill press.
I bought this for a AR-10 chambered for 6.5Creedmore built for PRS Gas Gun, Quantified Performance, etc matches. I installed it on Brownell's Titanium BCG and it has been perfect. You DO NOT need a modified gas key, it will fit any AR-10 BCG. It definitely smooths up operation. I will definitely upgrade every BCG with this part.