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Jose, since the extra tightness seems to be the issue during regular break down, I would speak with TriStar Customer Service for advice directly at (816) 421-1400 or by online inquiry here : https://www.tristararms.com/connect/
Jose, did you remove the charging handle on the bolt carrier. Here's a good link showing how to take it apart...........https://youtu.be/8gyedFHvG8U.............. If the barrels to tight to remove I'd recommend contacting TriStar at 816-421-1400 or here's a link you can use to email them. Sorry you're having trouble but hope this helps, link to email here............... https://www.tristararms.com/connect/
I would take it out and shoot it to get the barrel heated up then try to remove it while it is hot if that does not work,Please contact tristar (816) 421-1400 or by online here : tristararms.com/connect/