ACOG groove dimension?

[diegocn]

Does anyone know the dimension of the groove that the ACOGs sit in? I searched the internet and cannot find any. It'd be a bonus if someone knows where to order a mill bit that can cut the groove in one go.

I have a primary arms 3x prism sight ready to go on my SKS. The sight has the same groove on the bottom as ACOGs. Sight does come with a picatinny rail mount adapter. However my SKS uses a side mount where the picatinny rail is already higher than optimal. The adapter adds about 1/4" of extra height. Hence I'm trying to make another side mount that has the acog groove milled in directly instead of having a picatinny rail.

 

[diegocn]

I answered my own question with an angle measure.

The sides of the groove are at 45 degree angle to the top. The depth of the groove does not have to be precise, as long as it's roughly the same as the depth of the optic you try to mount. The primary arms mount I have measured to 0.103 deep. A chamfer bit or double angled mill bit should do the job.