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Some AAC cans will tighten down just with a tiny but of movement in the locking tab between the teeth of the muzzle mount. My friend's M4-2K does this. It does not have any negative effects on accuracy and I've never seen it loosen on the mount. Its just an anoyance. I have heard stories about cans coming off the mount but the reality is any QD mount can fail. They have the 90 tooth mount for their newest cans that suposedly solves this problem but the military is still buying the 51 tooth mounts.
As far as the can going inside the rails, don't do it with a AAC can. You won't be able to push in the locking tab to remove the can from the mount. I think a YHM might work better for mounting inside the handguard.
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"9mm has a very long history of being a pointy little bullet moving quickly" --Sevens
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