The piston AR in the world of real high speed low drag was intended to make Short Barreled Rifles (SBRs) with suppressors reliable before we understood how to make SBRs with Suppressors reliable with the DI system.
Now days the guys in the know understand how to make the DI system work better than any piston in the first 2000 rounds or so without any cleaning or maintenance.
Give me a shovel and some nice dirt or sand and I can stop a piston gun sooner than a well built DI gun in the first 2000 rounds from a good cleaning and lubing.
After 2000 rounds and no cleaning then the silly piston might have an advantage.
The overpressure of the DI system will blow sand and crap out of the action long before the carbon build up will be a problem.
John Burns
I have all the sources. They can't stop the signal.
