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RECIT wrote:

The Annoyed Man wrote:I believe that one of the advantages of the gas piston systems is that they are tunable, more or less on the fly, for different loads. That being said, I've fired 45, 55, 62, 68, 69, and 75 grain cartridges through one of my ARs with the standard gas system, and I would say that most of the deviations in accuracy are due to barrel twist, than due to the gas system.

It is not the piston system that affects the accuracy, it is the heat. The piston system has more moving parts and in my eyes more to break or go wrong. Yes they stay cleaner and cooler, but unless it is a work gun for you I would not spend the money on a piston conversion. I have always heard keep em clean, keep em clean, and then get serious about keeping em clean. I have never had issues with my rifles as long as they were relatively clean. Any of the twist rates of the barrels are accurate if you find the ammo they like.

Also if you are set on a piston conversion, there is a newer set up out there that connects the piston to the bolt carrier and the contact is made it the gas tube. Instead of the piston being connected to the lever in the gas block and the contact being made outside of the gas tube and smacking the bolt carrier. This design supports the impact of the piston more and is less likely to wear from what I understand. I am unsure of the brand name though...