These are the same issues as with the Calmini bumper for the classic Xterras... undersized mounting holes and a too short latch pin. Quite a few reports of them popping open on the trail. I would have thought they would have corrected this by now.

But, that's about 30 fewer problems than I had with my KMA bumper!
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ChuckH
"Every morning when I wake up I know it's not going to get any better 'til I go back to sleep again!" Al Bundy