The author, Scott Witner, notes that there are a lot of reasons people might not run a suppressor on a 10.5" AR, including that even with a suppressor it is still not hearing safe, so why bother? In any event, to slow down the BCG so it doesn't beat the weapon to death (or, I would add, cause feeding issues like the BCG outrunning the speed at which the magazine can push a new round up to be picked up by the BCG), he recommends an H2 buffer and the Sprinco Enhanced Power AR-15 Buffer Spring – Blue, which is a stronger spring "due to running an over-gassed or suppressed rifle." It is also made from "chrome silicon wire and heat-treated for extreme durability, this spring delivers consistent performance across tens of thousands of rounds without degradation or fatigue."
I went with essentially the same buffer setup in my 18" AR build because it was overgassed and running too fast as I described in this post where I had to troubleshoot what initially appeared to be a short-stroke problem (it wasn't). I used the H2 buffer (or something basically the same weight) and subsequently replaced the standard AR spring with a heavier flat coil spring.
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