jasonx 2 Posted September 6, 2019 What I have: Ruger Mark IV Hunter What I plan to buy: https://www.amazon.com/Ruger-90623-1913-Picatinny-Rail/dp/B06XG9PJ2B What I want to mount: https://www.amazon.com/Swiss-Arms-rifle-weaver-picatinny/dp/B001KN32AQ --------------------- What I have: Walther Creed What I plan to buy: http://www.egwguns.com/pistol-and-red-dot-mounts/trijicon-rmr-sight-for-walther-ppq/ What I want to mount: https://www.amazon.com/Sight-Tactical-Micro-Adjustable-Reflex/dp/B07T4GRZSZ Quote Share this post Link to post Share on other sites
jasonx 2 Posted September 8, 2019 Anyone have an idea? Quote Share this post Link to post Share on other sites
oldguysrule649 397 Posted September 8, 2019 Last year I mounted a Viper red dot to my Mark IV Hunter. Turned out to be quite a challenge. Ruger”s rail was not to spec, needed to shim the rmr to zero it, which then required special screws, etc. I posted a lengthy writeup somewhere. Will try to find it tomorrow and repost here. Quote Share this post Link to post Share on other sites
oldguysrule649 397 Posted September 8, 2019 As promised, here is what I posted to Rugerforum.net last year. My RDS has remained securely mounted since that time. No issues. This may not exactly match your situation. However at least some of it is likely relevant and will save you some heartburn. Wanted to share my own experience mounting a Vortex Venom on my Ruger Mark IV Hunter. First I want to thank LanceS4803 for pointing out the “rocking” issue with Venom on the Ruger rail. Had he not started this thread, I would have not noticed that I had the same issue. After three weeks of frustration, I finally have my RDS mounted to my satisfaction and tested it at the range today and am very happy with it. The bottomline, based on my personal experience, is as follows: When you purchase your Venon RDS, I recommend you order the following three items at the same time. This will help you avoid the frustration I experienced and position you for a successful installation the first time. · Tandemkross Shadow rail #TK05N0014BLK1 www.tandemkross.com · UMTactical shim. “Delrin Shim 1.0 Degree for Vortex Venom…” www.umtactical.com · Longer mounting screws from Brownells to connect the Venom RDS to it’s supplied picatinny mount. Part #080-535-645 6-48x5/16 Filister slot headed screws. Details as follows: 1. I recommend not purchasing Ruger’s own #90623 rail for the firearm. They are in fact NOT Mil-Spec. Specifically, the depth of the top grooves should be 0.118” which is the MilSpec standard(refer to Wikipedia.) I measured it to be 0.100. Both my original purchased in November 2017 and one they recently shipped me as a replacement for it were identical. Thus the crossbar on the Venom mount bottoms out slightly. For comparison, I checked the slot depth on the rails on my M&P 15/22 as well as my RUGER Precision Rifle. They all measured between .120-.125”. 2. So I did some research into alternatives and ordered the Tandemkross rail. A bit disconcerting was the fact that the screws that TK ships with their rail have a tapered head while the screw seating area in the rail itself is not tapered. I called TK and they basically said not to worry about it. (Interestingly, she stated they source their screws from Brownells.) That aside, the TK screws were the optimal length and I used them without any issues. I applied blue Loctite to the threads and torqued the screws to 10 inch-pounds using my Wheeler “Fat Wrench” torque wrench. 3. The reason I recommend the UMTactical shim is because I ran out of “Up” adjustment on the Venom itself in order to get a zero at my desired 10-15 yards. On my Venom the “Up” screw will rotate 5 turns for a total of 150 MOA adjustment range total. (Fwiw, the specs state 130 MOA.) Nevertheless, it was not enough. The shim is installed between the RDS and the Vortex supplied picatinny mount that ships with it. Put the thicker end of the shim toward the rear and the thinner end toward the front. I.e. you want to cant the RDS downward in order to raise the point of impact. With the shim in place, I was easily able to zero it without hitting the limits of the elevation adjustment. 4. I purchased the TK Shadow rail in Black. From reviews, their gray color does not match stainless steel. Looks good and matches the Vortex mount and RDS. 5. The screws Vortex supplies to mount the RDS to it’s picatinny mount are T15 head 6-48 x ¼. However they are not long enough to be used with the UMTactical shim. They only grab by a few threads and I easily stripped mine. Hence, my recommendation to use the above mentioned screws from Brownell which are 5/16 in length. Note that the Brownells screws have a slotted head and the diameter of the head is a little smaller than the Vortex supplied screws. Nevertheless they worked fine. I also torqued them to 10 inch-pounds. 6. I shot 180 rounds thru it today and so far everything is still tight. Am finally pleased with the setup! I could not find an exact matching 5/16” length version of the Vortex supplied Torx head screws. I called both Vortex and UMTactical and neither sell them. So if anyone knows where to find a T15 head(.220 OD) Fillister 6-48 5/16” long(the threaded portion) screw, let me know. Hope this helps, regards. Quote Share this post Link to post Share on other sites
jasonx 2 Posted September 9, 2019 So I decided against that approach for the Walther. The HMRs that appear to be compatible are either over $200 or fall apart. Will something like this modify the gun to accept picatinny sights? https://www.amazon.com/HWZ-Arrival-Universal-Tactical-Picatinny/dp/B071VSCJBH Quote Share this post Link to post Share on other sites
jasonx 2 Posted September 11, 2019 The rail attached perfectly. No problems! I decided against the 4X scope and opted for a 1X red dot, which also fit very well. Have not fired it yet, but it seems solid. Have not done anything with the Creed yet :( Quote Share this post Link to post Share on other sites