As Markm stated, a piston gun is not really necessary. The gun was originally designed by HK, for a certain Tier 1 military unit. As far as I'm concerned, most gun companies who build them, are still in the developmental stage. Out of all the piston guys out there, besides HK, I would consider the LMT piston, to be the most reliable. You will never run the gun as hard as the unit guys, or enough to appreciate the piston design. Most want it thinking it's more reliable and less maintenance. It's not a self cleaning oven. Debris still builds up in the chamber area and the carbon is deposited in the other end of the weapon. Carrier tilt, is an issue with pistons, but it is being addressed. Many of the companies, still have too many issues with their product, to offer any significant advantage over a DI gun.
For God and the soldier we adore, In time of danger, not before! The danger passed, and all things righted, God is forgotten and the soldier slighted." - Rudyard Kipling
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