Well, if you think your barrel might be a tad loose, and you wanna tighten it up, go ahead and get a large zip lock bag. How do I know? Well lets just say the the detente and the spring for the barrel latch got plumb away from me. Ordered another this afternoon. Put the latch end of the barrel into the zip lock in case you somehow push the latch catch all the way back and out of its track. While on this subject, do the rings with the notches all the way around have one that is larger so that the latch can catch on that one? Mine does. I think there is also a witness mark on the ring housing. Just making sure mine hasn't somehow wallowed one of the notches out.

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War Eagle!!!