Over the past year or so I have had 3-4 extractor failures, many FTE with this barrel (bought new) and have trouble manually cycling rounds. I have read about tight chambers from DPMS however these symptoms have been present with every type of ammo I try(match 308, surplus, full length resized reloads).I have polished chamber using the .410 chamber mob method with no real improvement. Does any one have any other Ideas? or some contact information of someone that could check the tolerances of the chamber and possibly ream it out? Please Let me know. Thanks, Nick