I RR M4 will occasionally fail to eject the brass. It is really stuck and requires some aggressive pressure from a cleaning rod. I probably clean it every 400 to 500 rounds. Yes it sticks with Wolf but also M193 and q3131 and walmart white box. It does not happen that often, maybe every couple hundred rounds. I want to use it in a carbine class coming in May but I am leary of the gun.
My Armalite 16 A4 shoots and shoots the same ammo and refuses to mess up. I may take the eotech off of the RR and put it on the Armalite.  Any ideas?

That's actually failure to extract.  Since the case is actually stuck in the chamber, I suspect it could be caused by either a rough or dirty chamber, or possibly a  chamber that is too small.  I would clean the chamber well, and check the headspace.

Also, does the brass show any signs of excessive pressure?

Thanks for the correction. I did not think that looked right.  The brass looks fine. I will have the head space checked. If it is a little tight what will correct the problem? Thanks for your input

Its possible that the chamber needs a good polishing...

Quoted: Its possible that the chamber needs a good polishing...

If I have to ask how I probable should not be doing it? How is it done?

Quoted: Quoted: Its possible that the chamber needs a good polishing... If I have to ask how I probable should not be doing it? How is it done?

LOL, its easy and I bet you can do it...

Chuck up the end section of your cleaning rod in a drill... Attach a chamber brush, or better yet a copper bore brush for a .45... Put some oil on it, insert it into the chamber and then power up the drill...

Do a couple of GOOD polishings, dont be scared... Be sure to clean out the chamber between polishings...

Polish the full length of the chamber but try not to allow the brush to enter the bore... ETA: It is unnecessary to polish a chamber beyond the shoulder.

If you do happen to enter the bore though, it isn't really a big deal and shouldn't hurt anything because the most critical part of the bore is the few inches before the muzzle...

.

Quoted: Do not put the FS top slot at the 12:00 position. The top slot is off indexed top dead center to prevent the Flash from whiting out your sight picture when fired (read low light conditions). The top slot indexed at either 11:00 or at 1:00 is the correct position.

Wrong...

Quoted: Never, and I mean never, spin a brass or steel bristle bush in a chamber using a drill.  What is going to happen is that the bristles are going to groove the chamber, leaving the chamber in a worst condition that before. In regards to allowing the rifle to self polish the chamber out on it's own, use brass case ammo with the upper beraing surfaces correctly lubed to allow the ammo (case) to polish threw live fire.

Wrong again...