LC9 rear site

[SCREAMIII2006]

I recently purchased a used LC9 with the laser.
I love it so far for carry purposes.
While at the range, I watched my nephew shoot 2 mags thru it.
It was an outdoor range so we didnt use the laser.
He only got 6 rounds on paper and I know he's a better shot then that,I taught him how to shoot
Upon closer inspection, the rear site is loose and sliding all over the place.
Do I need to loctite it in place or just tighten it down?
Plus should I site it in at 10 yards like the factory does for the laser?
Any help,thanks in advance.

 

[Sport45]

The rear sight is drift adjustable so you only have left-right and no option of sighting for any particular distance. That is unless you have a different sight than Ruger installed at the factory. I'd just center it up and be done with it.

Loc-tite shouldn't be required, but couldn't hurt either.

 

[SCREAMIII2006]

Thanks
Do you know what the little spring loaded button is under the rear site?

 

[Sport45]

Plunger and Firing Pin Blocker Spring.

I haven't had mine apart, but I've watched a youtube video about getting the firing pin out.

Here's an exploded parts diagram. If you hover over the highlighted part it gives the description...

Ruger LC9 Parts

You get that drawing if you click in the "Click here to identify parts you need" on this Online Parts Ordering page.