Sig Romeo 5 doesn't fit

[SoonerP226]

Looks like there might be the triangular piece missing on the bottom left side of the mount?

I thought the same, but it looks like SIG uses a different clamp style:

 

[SoonerP226]

I take it the clamp for the left side (in your 1st photo) is what grabs the dovetail on that side? Is your screw too long and running out of threads? (bottoming out before tightening?)

From the images I’m seeing of mounted Romeo 5s, it looks like he has way too much thread showing, so the bolded part seems likely.

 

[Ready_fire_aim]

I’ve never owned a sub2000 I’m not sure what quality of pic rail comes on them. But I have experienced cheap plastic pic rails being an issue getting optics snugged before

 

[SPDguns]

I got it! It's the blue charging handle and selector!

I win, mods please lock.......

 

[bink98xcab]

Looks like a knockoff. I have a few romeo 5's, and that mount and font look a little off.

 

[HarryBear]

I watched a video once explaining 1913 rails. Some manufactures use the mil-spec dimensions and some companies "wing" it on dimensions causing mounts/etc to not fit properly. You may have a 1913 rail that was not measured to the mil-spec dimensions and therefore your 1913 mount is incorrectly loose, etc.

 

[cal7.62x39]

I am leaning towards a knock off. I just sent one back to amazon for the same reason. They are getting better and better at clones. The battery cover does look thin/ knurles arent looking right. Easiest way to tell is that real sigs ship with an energizer brand battery, the knock offs ship with a different/unbranded battery.

 

[bigred1]

I am leaning towards a knock off. I just sent one back to amazon for the same reason. They are getting better and better at clones. The battery cover does look thin/ knurles arent looking right. Easiest way to tell is that real sigs ship with an energizer brand battery, the knock offs ship with a different/unbranded battery.

I didn't know about the battery brand thing....good to know.