Successfully Installing a RMR on a VP9

This post is a follow up to my frustratingly unsuccessful initial attempt at mounting a Trijicon RMR Type 2 to an optics ready H&K VP9. The second time around things came together.

The short version of what happened in the first attempt is that I couldn’t find the torque specifications for the screws that attach the adapter plate to the slide nor the ones for the screws that attach the RMR to the adapter plate. After obtaining those specifications and following the instructions laid out in the VP9 owner’s manual I was left with a wobbly RMR on the VP9. It was a frustrating. Very.

After venting about my experience and results on social media, I combined some of the advice I received from a few folks whose opinion I value and went back to inspect the installation. Here is what I found.

  1. The long screws supplied with the RMR protrude a little bit below the adapter plate.
  1. The optics cut on the VP9 slide have a couple of recessed areas that appear to supply the clearance required for the long screws supplied with the RMR.
  1. When I follow the installation steps supplied in the VP9 owner’s manual using the torque specifications I obtained, the screws don’t go all the way in which results in a very loose RMR sitting on the VP9.

Close inspection of recessed area of the slide where I suspect provide the clearance the RMR screws require, show a little bit of marring along the edge where the screws seemed to get stuck.

One suggestion via the Twitter suggested the use of the RMR mount sealing plate I had already ordered.

Additional conversation got me thinking I could try the shorter screws supplied with the Glock MOS mounting kit. So I ordered one of those as well.

Meanwhile on the Instagram, I received a suggestion to use rubber mallet on the adapter plate to ensure it was properly seated before attaching the RMR. While that suggestion didn’t yield any different results, it did get me thinking maybe all this needs is a little elbow grease applied with a bit more finesse and tact than using a mallet.

Turns out I was right. Here are the steps I used to get it installed.

  1. Rest the adapter plate properly on the slide.
  2. Insert the long screws supplied with the RMR (without the RMR) into the holes they are supposed to go in later.
  3. Gently tighten the screws as the snuggly go all the way into the recessed cut out on top of the slide.
  4. Insert the adapter plate screws.
  5. Set torque wrench to 2 Nm (or 17.7 in-lbs).
  6. Tighten the adapter plate screws until the torque is reached.
  7. Remove the long screws supplied with the RMR.
  8. Optionally, place the mount sealing plate (I recommend getting one and installing it) on the adapter.
  9. Place the RMR on top of the adapter plate (or on top of the mount sealing plate if present).
  10. Insert the long screws supplied with the RMR.
  11. Adjust torque wrench to 12 in-lbs.
  12. Tighten the RMR screws until the torque is reached.

Voila!

For what it’s worth, the shorter screws supplied with the Glock MOS mounting kit will secure the RMR to the adapter plate (even when the mount sealing plate is present). However, I like the idea of using the longer screws.

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