velocette
Member
I know, I'm trying to make a silk purse out of a sows ear. Not possible. The M70 will never be a Sig or a 1911. It is a strong, durable pistol, built to stand up to heavy abuse. Beautiful and well crafted, not so much.
But it can be significantly improved.
1, The trigger pull, Fairly clean and crisp but HEAVY, like VERY HEAVY.
Its a 2 stage, the reset spring and the sear spring are both flat steel springs. Reset difficult to remove & the sear spring essentially impossible to remove. So on both, I used a small Dremel cutoff wheel to
cut a slot down the center of both. Leaving the top & bottom alone. This reduced the strength of the springs. Trigger pull dropped from over 10 lbs to about 8. (Still off scale on my trigger pull guage)
disassembled the hammer / sear, assembly, cleaned & polished all moving parts including the drilling where the mainspring resides. Changed NO angles or engagement surfaces. Trigger pull down to about 7 lbs but nice and crisp with clean re-set.
The barrel was short chambered as I received the pistol. Standard 71 grain ball ammo would not enter the chamber all the way & then jammed up the slide as the bullet stuck on the rifling.
Fired .32 acp cases would chamber, so the problem was the leade was too short. Found me a reamer of the proper taper & diameter & cleaned up the rifling just ahead of the chamber. Cut a little, test, cut a little, test, till the rounds chambered properly, then polished the area.
Now I have a pistol that has an acceptable trigger, will chamber all the ammo I have on hand.
Finally, I must address the pistols love of nose diving rounds out of the magazine into the feed ramp, thus jamming the pistol.
Any ideas or suggestions out there?
But it can be significantly improved.
1, The trigger pull, Fairly clean and crisp but HEAVY, like VERY HEAVY.
Its a 2 stage, the reset spring and the sear spring are both flat steel springs. Reset difficult to remove & the sear spring essentially impossible to remove. So on both, I used a small Dremel cutoff wheel to
cut a slot down the center of both. Leaving the top & bottom alone. This reduced the strength of the springs. Trigger pull dropped from over 10 lbs to about 8. (Still off scale on my trigger pull guage)
disassembled the hammer / sear, assembly, cleaned & polished all moving parts including the drilling where the mainspring resides. Changed NO angles or engagement surfaces. Trigger pull down to about 7 lbs but nice and crisp with clean re-set.
The barrel was short chambered as I received the pistol. Standard 71 grain ball ammo would not enter the chamber all the way & then jammed up the slide as the bullet stuck on the rifling.
Fired .32 acp cases would chamber, so the problem was the leade was too short. Found me a reamer of the proper taper & diameter & cleaned up the rifling just ahead of the chamber. Cut a little, test, cut a little, test, till the rounds chambered properly, then polished the area.
Now I have a pistol that has an acceptable trigger, will chamber all the ammo I have on hand.
Finally, I must address the pistols love of nose diving rounds out of the magazine into the feed ramp, thus jamming the pistol.
Any ideas or suggestions out there?