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Ok,if I understand correctly,this does not occur while you are shooting.It occurs while you are manually cycling rounds though your rifle.
And it is happening after you stripped and cleaned it.It is also a practically new rifle.
I'll get called a nanny here by someone,but I am generally rather reluctant to cycle live ammo through if I am sitting around my house.Please do consider the folks who may be only 6 or 8 sheets of drywall away.
New semi autos have a bit more friction in their system for a while.Maybe you get a percentage of drag there.
Did you properly lube it as you reassembled it?Lube is good.Lack of it will give a percentage of friction.
Now here is a suspect.You see,ordinarilly in function the charging handle is not moving.It is locked forward.Not saying you cannot do a recharge such as an immediate action drill by pulling back and letting fly,but more often,the bolt is held back by the bolt catch,a mag is inserted,and the bolt catch is released with the charging handle forward.
The extra drag of the charging handle flying forward is a percentage.
It may be that 2nd round feed ramp is slightly catchier than the first.
Recommendations:You really are not doing your ammo any favors slamming it through cycling.
While the charging handle will take a certain number of those slam homes,eventually that little hook will wear through the hard coat where it strikes the upper,and then that aluminum will wear pretty fast.
IMHO,I;d quit running my ammo through the rifle in the house,and I'd go shoot.It does work when you shoot it,right?
Shoot a few hundred and likely the problem will be gone.Good luck.
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