FX high capacity mag jamming?

 

My FX high capacity mag once in a while jams. Will randomly not feed a pellet, and I get a dry fire. Today i checked the cover, as I suspected the pellets might catch into something. Took a pellet and moved it allong the inside of the cover, and when it came to the feeding hole, it catched the edge.

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There was a tiny burr there not detectable by eye. 

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Took a dremel tip, and removed it by hand, and afterward I could move the pellet without it catching. Might be worth checking if some of you have the same issue:)
 
A litle update: Turned out the litle burr was not the reason the mag jammed. I noticed when it jammed, and I wigled the mag a litle, it would "click" the next pellet forward. When I installed the mag bracket, I did not remove all of the rubber balls for the original mag. The 2 closest to the barrel I did not remove, in case I wanted to use my old mag also. Removed them yesterday, and the high capacity mag has not jammed yet. Probably shot and reloaded 5 times today, with no issues. What I believe was happening was that the rotating disk inside got stuck because of either the cover, or back wall of the mag got squeesed against it by the rubber balls. It now has a loose fit, but works just fine. I remember the instruction manual said to remove all rubber balls. Sometime it probably pays to follow the the manual:)