How did the 5/16” screws fit?

Only use blue loctite.

 

Making sure I understand you. The "passing through the plate and hitting the slide" Are the holes drilled through reaching the inside of the slide? Loctite or Screw issue/concern? Do the ends of the screws interfere with function of the slide? IF SO.... Any damage you can see, i.e. scrapes scratches?

 

You should be able to check? IE take the plate off the gun, and install the holosun and screws on it. You then should be able to look at the underside to see if they are too long and would hit the slide

 

That is excellent information, thank you. I guess I have had an irrational fear up to this point about taking that plate off. Guess I'm afraid of finding out if they glued the plate or something. Like I say, irrational.

 

When you do determine which screws to use, apply some Vibratite. I’ve stopped using blue loctite because the Vibratite handles recoil/vibration better and can be reused a few times if your like me and constantly trying new setups.

 

On MRDS the purple loctite works best, in ase you want to easily remove it. Also, learned not to exceed the tourqe recommended by the sight maker.

 

I finally got this out and dealt with it. The reason they told me not to use the screws that Holosun provided was because they were too long and would bottom out on the slide. They used their screws which were shorter but did not have the correct diameter for the countersink, the head was larger than the Holosun screws. I took the plate off of the slide and attached the Holosun. It was obvious how much too long the screws were so I shortened the screws with my Dremel. I cleaned everything with alcohol, used blue loctite and reassembled. All is good.