Screw size, MK III

jd66921 · Post by **jd66921** » Fri Nov 20, 2009 6:19 pm

I know I've seen this before, but I'm looking for the size of the rail mounting screws on a MK III. #6-40?? How hard is it to drill these screws? Is the receiver hardened? I've got a Standard that I am thinking of putting a rail
on so I can attach a red dot scope. I've got a drill press.

Thanks,

Jeff

blue68f100 · Post by **blue68f100** » Sat Nov 21, 2009 9:17 am

I believe you are correct on the 6-40 screw size.

As far as drilling a receiver I would not attempt it unless it was done in a endmill. Hard steel and SS have a tendency to cause the drill bits to walk. Beside trying to drill on a curved surface. Generally you will start with a center drill.

greener · Post by **greener** » Sat Nov 21, 2009 10:56 am

If you don't want to drill and tap the Wiegand rail has had good reports. Replaces the rear sight mount. The downside is you can't remove the optics and shoot the iron sights.

http://www.rimfiresports.com/merchant.m ... Code=VC2SM

Post by **Bullseye** » Sun Nov 22, 2009 11:15 am

No, those screws are 6-48tpi threads. You can get a rail & rail screws at Jack Weigand http://www.jackweigand.com/rm2fd.html

I wouldn't drill it with a drill press without using a mounting jig or some centerpoint twist drills.

http://www.midwayusa.com/viewProduct/?p ... ber=341035

R,
Bullseye

jd66921 · Post by **jd66921** » Sun Nov 22, 2009 1:38 pm

Thanks. Guess I'll skip the rail mount for now!!

recumbent · Post by **recumbent** » Sun Nov 22, 2009 8:08 pm

jd66921 wrote:Thanks. Guess I'll skip the rail mount for now!!

OR take greener's advice and get the Weigand no drill mount. They work.

jd66921 · Post by **jd66921** » Thu Nov 26, 2009 5:45 pm

So, will that rail mentioned above fit on a standard MKIII? Is the sight
dovetail the same size as the other pistols? Does it work as advertised?
The current sight is just drifted out sideways?

Thanks,

Jeff

Post by **Bullseye** » Fri Nov 27, 2009 12:24 am

Yes, yes, and yes. Mount the receiver securely in a padded vise and drift out the rear fixed sight. The Weigand will mount to the dovetail and you'll be very happy with it.

R,
Bullseye

jd66921 · Post by **jd66921** » Fri Nov 27, 2009 8:46 pm

Thanks all! Looks like something to look at down the line a bit. I've got VQ
trigger and sear coming, so I don't want to totally confuse myself.

I appreciate all the good info I've collected here!!

Jeff