RS Regulate AKRK Modification for SLX Micro

I won a bunch of RS Regulate accessories in a raffle drawing at summer Kalashnicon 2021, I am very fourtane and thankful to have won anything at all. Big thank you to RS Regulate and Kalashnicon!

One of the items was a side rail and an arak adapter for a red dot. I recently purchased a primary arms SLX-3 micro prismatic optic and very much wanted to direct mount it to my rifle but I did not like how high it set with the picitany adapter and I would rather have a v-groove in the AKRK and bolt directly to the optic. The SLX sits at least a half inch lower if I was able to direct mount it to the AKRK.

Figure 1. Top of AKRK before modification

Figure 2. Bottom of AKRK before modification

The operations were as follows

1. Place the picitany rails face down in the parallels and Vise. Using a 3/8 endmill find the center of the slot by leaving equal distance between each side in the existing slot. Increase the current slot length to 1.75"-1.875" by milling out the current slot more to the existing depth.

2. Clamp the AKRK into the vise, picitany rails up, on parallels and make sure its relatively (eyeball'd it) square to the top of the vise. I found the center of the U-shaped groove with a flat bottom 1/4" end mill by adjusting it until it was touching both sides of the U.

3. Use a 1/4" square corner end mill to mill the vertex of U flat.

4. Use a 1/2" square corner endmill to leave a 1/8" height difference the 1/4" wide bottom and the 1/2" top.

5. Drill the three 0.201" holes in the top of the 1/4" trough exactly 0.625" from center to center.

6. Using a 45 degree chamfer tool mill a chamfer on both sides. Touch the chamfer too the the bottom of the 1/4" channel and raise it a couple thousandths. I milled a chamfer on each side 0.110" from the center. In reality it should be 0.125" from center but I was being cautious as you do not want the flat part of the mount and the optic to touch, the V-groove should cause it to self align.

Figure 3. End of step 3, you can see there is a small amount of canter to the mill in the Y-axis but It does not matter for this because it is miniscule and everything will be square relative to each operation.

This is a hard way to do it but not the most hard, you could go do this all with a 1/4" end mill and a 0.201" drill if your patient enough and like messing with the mill head angle.

Alternatively you could combine step 3, 4 and 6 by using the tool shown in Figure 4 but I am impatient and bought the tool from eBay then proceeded to do it as I described above because I did not want to wait a week after I bought the tool. Story of my life... although time is money! I wasted both by doing what I did (20 buck ebay tool and an extra hour) but I learned a lot and I am satisfied with the results. Learn from me a wait for the tool.

Figure 4. The tool that would have made this project take 1/3 of the time and contemplation but was 75 bucks on Mcmaster.

Enjoy the finished product

Figure 5. Final result. I don't think I will coat or paint it. I'm not really conserved about corrosion and you can't really see the shiny aluminum.