Originally Posted by MacCool

Several reasons a round might not be ejected properly...a) if the chamber is too tight that it's too hard to get the spent shell out b) if the extractor isn't grabbing the cartridge case rim correctly c) if the counterpressure being applied by the ejector is weak or off-center d) if new rounds from the magazine are interfering with the spent round because of abnormalities in the feed ramp.

Apparently your gun was having cycling problems. They took a broad approach by making sure the ejector and extractor were up to snuff so that shell ejection would be appropriate, then they made sure that chambering new rounds was optimal by addressing the feed ramp and by making sure the barrel's chamber was appropriately sized.

The fact that they tried to cover all the bases without identifying one exact problem is concerning. One has to wonder if that's because of a bad design of the weapon, or if it's part of their value-added custom shop operations. If I buy a gun, I buy one that doesn't need to have the ejector, extractor, chamber and feed ramps fixed after the sale in order for it to function correctly. Not exactly confidence-inspiring. I'd be wondering what the problem with the gun actually was.