Originally Posted by bluemountaingun
I have these come into my shop frequently. It is a rather easy problem to solve. The feed ramp comes from the factory with a too steep or nonexistant angle. This causes serious FTF and FTE problems. You will need to chamfer that ramp. A quick, 5-minute fix is to take a rotary tool with a felt pad coated in #5 or #6 polishing compound and polish that feed ramp mirror smooth, while chamfering the edge. I will work the entire lower half of the chamber rim that you can see on the rear of the barrel assembly. Seems to work everytime! God Bless! Jerry
This might be a very good way to fix a failure to feed but the problem is a failure to eject , it sounds more like something is preventing the bolt from going back, low power ammo, maybe a kinked spring , substituted too heavy springs, no lubrication , accumulated powder residue and carbon. A schematic is available here http://stevespages.com/page7a.htm
look under ARMALITE . A manual is here http://stevespages.com/page7b.htm
look under CHARTER ARMS AR-7 EXPLORER. I would start there before I took a DREMAL to the feed ramp. After you get it ejecting and if you have a feed problem then try the feed ramp polishing.