Third Party Press

MS420 Dating and Magazine

eurydice

Junior Member
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.
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.
The pitch is 0.8mm measured with a gage (0.7 and 0.9 mm don't fit so exactly in the thread)
I measured two out of the shelf M5x0.8 with another caliper (digital 0.01mm - followed by a cal lab) : 4.82 - 4.84 mm
I would then also say that 4.75mm is undersized (screw quality?).
 

rlrski

Member
thanks for the additional info!

I will keep an eye out for a early Mauser and get a batch made up.
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.
 

Fal Grunt

Senior Member
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.
 

rlrski

Member
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.
I don't think there are very many of the early 420s around. Most seem to be the later 420B and 420n versions. I'll kepe you posted on what I learn.

Dick
 

eurydice

Junior Member
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.
Fal,
I checked on several MS420 (early and late banners), MM410 (early banner), MM410N and MS420N, the screws are the same.
I also check that a standard (in Europe) M5x0.8 screw fits in the action (with more clearance than the Mauser's one); the Mauser's screw also fits in a M5 nut (also with more clearance)
Take care that ES340 screws have same thread but different design.
DSC_2528.JPG
 

rlrski

Member
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.
 

GEM

Senior Member
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.
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.
 

rlrski

Member
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.
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.
 
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