I think it's the CARRIER they mean but without endurance test data, impirical models and data what does it TRULY mean? We have to call this anecdotal. Yes, heat is not good when you add cyclical loading but just HOW much makes a difference? I dunno and to be honest since I don't know I cannot say I "care".
The piston adds a little complexity and reduces "stress" by reducing temps on some critical items. It simplifies cleaning the bolt/bolt carrier assembly but the impact of the piston *may* reduce the bolt lug life - gotta see the correlated FMEA models and impirical data to know for sure. There is a weight (balance) penalty with the piston and the recoil impulse is sharper though the overall force hardly changes - it's still a 5.56 NATO cartridge.
If you've got the coin and so motivated purchase the piston carbine. If not, stay with the D.I. carbine - google "Greg Pannone, AR-15 Reliability" and follow his advice if you stay with the D.I.




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