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Is excessive wear to the bolt/BCG due to heat really an issue? I like the added convenience of the gas piston and own one myself, but IIRC other discussions around here seem to have ended with the point that you will shoot out a barrel before damaging the parts which are now supposed to run cooler. And I haven't seen any claims about the gas piston designs extending barrel life.
It seems to me that the one group which might really benefit from gas piston rifles is shooting SBR's, which do foul more quickly. An HK 417 though? Seems kind of suspect, when the direct impingement alternatives run well and typically have much longer barrels.
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