I'm a very obstinate person ???

Firstly I've already stated 2 point which you guys
acknowledge:
1) Gas blowback has higher frequency of jamming and need daily
maintenence.
( also higher wear and tear as reported in the article below)
2) M4 has less effective range due to shorter barrel.
But you guys ignore the above points as if they dun exist!!!!
The article I have posted clearly stated :
The contenders participating in the upcoming test use a
piston-style operating system, which relies on a gas-driven piston
rod to cycle the weapon during firing.
By contrast, the M4 uses a gas tube system, which relies on the gas
created when a bullet is fired to cycle the weapon. Weapons experts
said blowing gas directly into the receiver of the weapon
spews carbon residue that can lead to fouling and heat that
dries up lubrication and causes excessive wear on
parts.
http://www.armytimes.com/news/2007/09/army_rifletest_070920/
Then you stated that it is it logistical reason, which dun even
stand in term of MAF.
Then you Chino bought inferior 5.56mm ammo, which atm still no new
standardised ammo, so a moot point.
Then you guys stated that due to most SF units are using M4
therefore it must be good, but the fact is, most US SF units are
now switching to H&K416 and discarding the M4.
Those switching over becos they dun think the M4 is good enough ,
therefore switching over to H&K416.
Now again , you ignoring the changes of weapon in US SF units ,
instead stated that the UK , OZ SAS still using the M4, therefore
it must be good.
But let me ask you guys, what if those SAS units will also switch
over to H&K 416 too, will it happen?
I will not be surprised, since the 416 is still relatively new, the
SAS units may be slow at adopting it , but they will certainly look
closely on the US SF units that are using the 416, afterall the
Delta force purposely collaborated with H&K to come out with
416, so based on f/b from them and their own evaluation, I will not
surprised they too will switch to 416!!!
Then will you guys ignore the above and come up with more
excuses?!? 
So who is being obstinate???

Lastly as I asked you guys is there any army using M4 as a
standard infantry AR???
Remember the operative word is standard infantry,
not SF.