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I ordered a Spikes Tactical barrel for my first AR build. When it arrived, I tried to fit it into my BCM upper, but I can't get it to fit at all. The barrel starts to go in the receiver and then sticks. The last time, I could barely get it back out.

Is this normal? could my receiver have size issues? Everything else fits fine (lower, BCG). Do I need to grease the barrel first? Get a hammer? Get a new upper? Any advice would be appreciated.
 
The ARs I have assembled fit together easily. I would measure the barrel extensions OD and the receiver ID, look burrs or imperfections in machine work.
 

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