The last two times I went to the gun range i was having a problem with my ar short stroking.  

It constantly failed to feed a round into the chamber.  At first i thought the problem was it had simply just gotten too dirty but i cleaned it as far as i could go.

Now the only thing I can think of is its my gas tube is clogged.  How can i fix that?

Anyone else have any other ideas of what it could be?

I replied to your other post.

is this a new rifle?