I measured a MS420N screw with a caliper (analog 0.05mm) : external diameter between 4.9 and 4.95 mm. The caliper accuracy has not been checked for years.I'll take your word as I do not have one, but 4.75 is undersized for a 5mm screw? It is just surprising, usually Mauser runs pretty high on the thread spectrum.
FAL, hold on before making a front machine screw for the early MS420. Eurydice measured his M5x.8 at 4.82-4.84 mm and I measured the one screw I have with hex head and it measures at 4.66 mm, smaller than the other measurements. I'm going to visit my smith in the next few days to use his thread gauge and other stuff to determine just what this is, and I'll report back to the board when I find out.thanks for the additional info!
I will keep an eye out for a early Mauser and get a batch made up.
Fal,I'll buy an early example so I have parts on hand so I can measure the pitch and check the fit in the receiver.
To remove the bolt: slide safety to forward/fire position then pull trigger fully to the rear. Bolt will slide out with a little resistance.Update on my Mauser MS420 S/N 32349. Eurydice is correct, the screw is M5x0.8 and is approximately 28 mm in threaded length. I found a 30 mm long one and it bottoms out without snugging to the trigger guard. Also purchased the sloped bottom magazine from Riflemags in the UK, was delivered today and fits and appears to feed well. Butt plate from Triple-K does not fit the stock, so will be returning that. Also returning the screws to FAL Grunt by mail, probably going out tomorrow.
It's going to my smith this week for deep cleaning, derust and overall check out before I try to fire it. Can't see how to remove the bolt for cleaning with the side safety action. Any suggestions?
This board is GREAT and a big help to us (old) newbies.
Good Morning, and Thank, YOU! That's pretty easy when you get the clue. Up to this purchase I've mainly been a single action revolver and lever action rifle guy.To remove the bolt: slide safety to forward/fire position then pull trigger fully to the rear. Bolt will slide out with a little resistance.