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Make sure your extra barrel has the same magazine cap detent in the barrel ring that your current barrel does- newer Express barrels have a different system to retain the magazine cap
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Yep, and express finished barrels with detents are getting hard to find out there.
Some other tricks to retain the mag cap.....
1) a turn or two of teflon tape on the threads
2) a rubber o-ring between barrel ring and magazine cap.
I've used both methods and had the mag cap stay in place over 100 rounds or so of shooting.