Auto426, Honestly then, tell me why Delta and a majority of DEVGRU are running piston guns? They have unlimited budgets and can pick any weapon they want. Hk,LWRC, and a few number of DI guns. The marines are adopting the M27 an Hk 416 variant to replace the SAW M249. They run so many rounds without issues...
You can argue all you want about how di guns have came around but tell the guys that use them aka Delta & DEVGRU they are using the wrong rifle, obviously they didn't get the memo.
I am done with the discussion because it is now becoming more about opinion then facts.. Read up on the HK416 for instance and why it is chosen. It's reliability and accuracy in suppressed and SBR has yet to be beat. Hence it's place in many many armies around the world and in our own special forces.
Take care us good talking to you, I am done about this, it is beating a dead horse...
As I said before the OP needs a good Colt,DD or so and be happy. Very few will ever reap the benefits of the piston gun. But they do have benefits...
P.S. I leave you with the comment of Larry Vickers, but you can search G3Kurz on HKPro, he worked on the project for years...
Vickers:
"The secret to the versatility being displayed here is quite simply the short stroke gas piston operating system. The same system that allows reliable functioning with a short barrel also keeps the operating parts cooler for a higher sustained rate of fire. It also validates my four basic questions that I recommend you ask yourself to determine whether a piston gun is right for you:
Do I have a need for a barrel length less than 14.5"?
Do I expect to shoot the gun suppressed extensively?
Do I have the requirement to shoot a wide variety of ammo?
Do I have the need to shoot a high volume of fully automatic fire?
If the answer is "no" to these questions, then a quality DI M4-style gun will fit the bill superbly. Just lube it frequently, use good ammo fed from good magazines, and clean it occasionally and you will have a gun that will give you excellent service for many thousands of rounds."
"If you have an existing AR15/M16/ M4 carbine and it works well for you now, replacing it with a HK416 may
not be justified. Most police and civilian 5.56mm carbine applications do
not require the level of reliable service offered by the HK 416. Plainly put, most folks can get along nicely with the old gas tube AR15 design weapon. But, it should be noted that a rumor from Colt Defense is that a new 5.56 NATO carbine is about to hit the market, the M5, which is a gas piston version of the M4. So, where there is smoke, there may be fire—or a gas piston.
If you want the most advanced evolu- tion of the AR15 system, combined with superb quality, check out the HK 416. Trust me, it’s a great piece of kit."