Receiver rail guide.

sheepherder · 02-27-2011, 08:35 AM

1969goatman - Can you post a closeup pic of the inside part of the abutment (like the pic above) so we could see how badly the abutment has been battered??? It's been said here that the "Mauser Hump" was incorporated into the grip frame to eliminate the problems caused by excessive 'abutment' battering (namely, the toggle axle pin becoming fully exposed in recoil and popping out)...

In fact, if it seems to you that it is 'battered', maybe post a pic of the assembled pistol w/toggle in full recoil (you'll have to hold it back with your hand) showing whether the toggle axle flange is fully exposed...

Here's a pic of my S/42 (same gun as pics above) showing the relation of my toggle axle pin to the frame ears, in full recoil (I'm pushing it back with my finger), and having the breech block imprint on the 'abutment' as shown in my pic...Not too bad, even considering this frame does not have the "Hump"...

Norme · 02-27-2011, 08:59 AM

Hi Rich, There is no difference in the over all length of a Mauser frame (120mm) with or without the "hump". The hump is not formed by adding additional material to the back of the frame, but by removing metal from the lower half of the back of the frame. Imperial era frames were 1mm shorter, and they had the axle pin jamming issue. Regards, Norm.

sheepherder · 02-27-2011, 09:02 AM

Quote:

Originally Posted by Norme

Hi Rich, There is no difference in the over all length of a Mauser frame (120mm) with or without the "hump". The hump is not formed by adding additional material to the back of the frame, but by removing metal from the lower half of the back of the frame. Imperial era frames were 1mm shorter, and they had the axle pin jamming issue. Regards, Norm.

Thanks for clearing that up for me, Norme! From what I had read, I had gotten the impression the Mauser Hump was added sometime in the 40's...

sheepherder · 02-27-2011, 09:15 AM

Just for giggles, I mic'ed my three grip frame 'abutment' widths, at the point of most wear...

S/42 = .255"
6782 = .250"
86434 = .253"

Interestingly, the 86434 shows no imprint of breech block or toggle 'lip' marks (it's a commercial 7.65 cal)...and the 9mm S/42 (pic somewhere above) with the sharpest breech block impression measures the greatest width...

I can't find a dimension on the blueprint, so I don't know if these are just tolerance variations or 'hammering' changes...

Norme · 02-27-2011, 09:34 AM

Hi Rich, I believe the axle pin jamming problem only became an issue post WW1, when hot 9mm ammo, intended for SMG's, was used in Lugers. This was corrected by extending the rear of the frame 1mm, on all Mauser and Krieghoff produced Lugers. I have no idea whether Simsons were also lengthened. What do you say, Ed? Regards, Norm.

02-27-2011, 09:15 AM	#4
sheepherder Lifer Lifetime Forum Patron Join Date: Feb 2009 Location: ...on the 'ol Erie Canal... Posts: 8,208 Thanks: 1,425 Thanked 4,474 Times in 2,343 Posts	Just for giggles, I mic'ed my three grip frame 'abutment' widths, at the point of most wear... S/42 = .255" 6782 = .250" 86434 = .253" Interestingly, the 86434 shows no imprint of breech block or toggle 'lip' marks (it's a commercial 7.65 cal)...and the 9mm S/42 (pic somewhere above) with the sharpest breech block impression measures the greatest width... I can't find a dimension on the blueprint, so I don't know if these are just tolerance variations or 'hammering' changes... __________________ I like my coffee the way I like my women... ...Cold and bitter...

02-27-2011, 08:59 AM	#2
Norme Always A Lifetime Forum Patron Join Date: Jul 2009 Location: Colorado Posts: 2,417 Thanks: 226 Thanked 2,607 Times in 933 Posts	Hi Rich, There is no difference in the over all length of a Mauser frame (120mm) with or without the "hump". The hump is not formed by adding additional material to the back of the frame, but by removing metal from the lower half of the back of the frame. Imperial era frames were 1mm shorter, and they had the axle pin jamming issue. Regards, Norm.

02-27-2011, 09:34 AM	#5
Norme Always A Lifetime Forum Patron Join Date: Jul 2009 Location: Colorado Posts: 2,417 Thanks: 226 Thanked 2,607 Times in 933 Posts	Hi Rich, I believe the axle pin jamming problem only became an issue post WW1, when hot 9mm ammo, intended for SMG's, was used in Lugers. This was corrected by extending the rear of the frame 1mm, on all Mauser and Krieghoff produced Lugers. I have no idea whether Simsons were also lengthened. What do you say, Ed? Regards, Norm.