The top of the grip does tuck into the frame. From this failure, I figured Luger's way of holding panels in place: its bottom position was fixed by big screw, its top tucks under frame, that prevents panel from flipping off, but with those two, the panel could still swing a little bit back and forth. On P08, that swinging was prevented by a wood ridge routed on the inside of the panel. On Interarms, the ridge was cancelled, replaced by this pin. This change probably was considered be an improvement by engineer, but actually it's not.
Other than that, the gun works great. I tried single shot, double tap, fast firing, all worked fine. Luger's grip size is a little bit too big for me, but it's still holdable.
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