Quoted: Are you kidding? What is so great about a gas system that pukes fouling crud and gases back into the bolt group?
I have used the M16 and AR15 for more than 20 years now, and HATE that filthy gas system. A self fouling rifle, that's what it is. The HK416 conversion was the best thing that has happened to the M16/AR15 platform, and now it's going away. there's nothing good about that.
If Colt would get off their butts and devise something like this, we would all be better off. The M16/AR15 is a good platfom but is not at the pinnacle of it's development yet.
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Gas piston uppers are nothing new guys... Colt & Co. have BTDT...
The RHINO system is IIRC, the first, it was (IIRC) evaluated and discarded by the military...
The fact is that NOT having a gas piston is a major bonus in terms of accuracy, and no major detriment to reliability in any reaslistic sense...
Sure, you get crap in the bolt group, but so what... Doesn't hurt anything... Just makes a bit more mess to clean at the end of the day... Plus, any *other* crap won't build up in the reciever, it gets blown out by the gas blast...
On the other hand, having a piston system makes for less accuracy and less controllability on full auto.
The AR is what it is because of the direct gas system, & straight line recoil transmission that accompanies it...
The only thing you get with piston op is the ability to have a folding stock, and a few minutes less cleaning time...
Personally, I'll take a little more time with the CLP (or invest in some brake cleaner), and keep the extra accuracy, thank you...
Then again, I keep my guns functionally clean, not spotless...