Can't really tell from the photos, but one thing to look at on sidelocks--and it's easy to do with the hand-detachable variety--is the face of the hammers. If they're dished, that indicates either insufficient metal hardening, or a lot of use, or maybe a combination of the two. I had some issues with a pre-Grulla (Union Armera) sidelock, but they related to the single trigger rather than to the overall quality of the gun.