Norinco M-93 (22LR) Missfires - Cured!!

Ganderite

Ganderite

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I could not resist this $150 plinker. Nice little gun. Comes apart much easier than a Ruger.

But I get a lot of missfires. 2 or 3 per mag.

A buddy who also got one has the same problem.

Tonight I took out the backstrap, which has the hammer spring in it. The spring is retained by a small pin. I pushed the spring in a pit to relive the pressure on the pin, and puhed it out easily with a small Allen key. The spring that dropped out of the back strap.

I then cut off the end of a 22 bullet using a pair of side cutters. I cut the bullet off just behind where the cylindrical section starts. I dropped this into the backstrap channel, point down. This results in a more heavily compressed hammer spring.

Have not tried it yet, but expect it to work.

I have done the same thing in other guns to increase firing pin strike engery.
 
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i ormally put lighter springs in my guns... :p misfires? what ammo are u shoting? are u sure theyre not simply duds? i dont have that problem with my m93.
 
Before you stiffen up the mainspring and stiffen up the trigger as a result I'd try a good detail cleaning of the gun.

It's not the power of the hammer's impact as much as it is about the speed. A light hammer and firing pin can set off primers easily if it moves with a snappy enough travel. But thick or gooey oil, such as factory shipping preservative, can drag on the hammer so that if slows down too much. It's like us trying to walk slowly vs running in waist deep water. Cleaning it and oiling with just a light smear of oil can often do wonders for the velocity of the hammer strike so it moves the firing pin with a lot more force. If it's still giving you troubles and obvious light pin notches after cleaning and re-oiling then I'd say it's time for your spring packing trick.
 
BCRider said:
Before you stiffen up the mainspring and stiffen up the trigger as a result I'd try a good detail cleaning of the gun.

It's not the power of the hammer's impact as much as it is about the speed. A light hammer and firing pin can set off primers easily if it moves with a snappy enough travel. But thick or gooey oil, such as factory shipping preservative, can drag on the hammer so that if slows down too much. It's like us trying to walk slowly vs running in waist deep water. Cleaning it and oiling with just a light smear of oil can often do wonders for the velocity of the hammer strike so it moves the firing pin with a lot more force. If it's still giving you troubles and obvious light pin notches after cleaning and re-oiling then I'd say it's time for your spring packing trick.
Click to expand...

Good advice. Even though it's been to 2 gunsmiths and is still a light striking jamomatic, I think I'll detail strip it and clean it just for fun. If I can re-assemble it and it still fcuks up I'll take a ball peen hammer to it. :p
 
Make sure the round it going completely into the chamber.....else the hammer is just pushing it in that last few thousands and not putting the dent in the rim as its supposed to.
 
BCRider and Super7 are both correct.

The pistol was stripped and swished in gas to remove all old oil and then lubed with CLP.

The barrel and chamber were scrubbed to mak sure ammow as not hanging up on some crud.

The chamber design and differences in bullet shape could cause the round to not quite seat. This would dull the impact and missfire. In fact, this may be why problem varies with ammo brand.

A harder strike might solve. i got home too late tonight to test the gun, but will do so tomorrow.

OK, I tested it. Just with the Federal hi vel ammo. 100% ignition. Trigger might feel a bit heavier, but still quite nice.

Edit: tested at range today. It shot all three types of ammo 100%. 2 hi vel and one stnd vel.
 
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