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For what it's worth, I've got the same Knifeworks Manix and it looks the same as yours. It's my 1st G10 Manix, and the lock looks the same as my LW Manix. The bit of steel showing in front of the thumb tab is the back of the blade.
The G10 version feels different than the FRN version, though The G10 action just feels a little smoother, and there's is an extra little click right when I start to open the knife. I think the extra weight of the liners and G10 absorb some of the impact of snapping the blade closed.