Does the factory bcg make this even worse? Is the h2 buffer enough to counter that, or should I look into a bcm bcg (whenever those are available again) for my m&p?
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The heavy buffer has absolutely nothing to do with mil spec vs commercial spec buffer tube, the ONLY DIFFERENCE that makes is the diameter of stock you buy, the heavy buffer would be recommended regardless of mil spec vs commercial.
The mil spec RE also has nothing to do with the ID they required for you to purchase it, that was all about price. Anyone can buy "mil-spec" it doesn't at all mean its NFA or an actual military FA/select fire weapon, it just means its made to the same exact size and standards as what the military specifies their weapons be manufactured to.
Like they mentioned when you put in the heavy buffer you need to put in a new (extra power) spring to compliment it, other than that start feeding it rounds, I always recommend you don't do any mods till you have AT LEAST 500 rounds threw any new gun (other than sights and/or hand guard of your preference). The only reason I think it would be ok to go ahead wih the H buffer/spring now is because of the known over-gassed issue. Not only do you need to become acclimated with how that specific weapon functions (you might have shot 100 AR15's in your life and be able to strip it and put it back together blind folded but you haven't shot THAT one and learned its personality yet) Plus if you have a failure within that short amount of time there is no reason the repair should be on your dime, and it could indicate a bigger problem.
Would the h2 buffer be to heavy for simple range .223 ammo?