If you shoot pistol competitions, you have seen someone start a match and then his mag falls out.
The problem is that some mags are pinned to 10 1/2 rounds, and some are pinned so tight that you can barely get #10 in the mag. It is the latter style mag that has problems.
When you start the match, the slide is forward, so when you seat the full mag, the top round hits the bottom of the action and has to compress the column of rounds a bit, so the magazine will latch. The mag won't seat unless it is hit - hard. If not, it falls out.
With a Glock and a S&W MP9 mag, the mag is blocked with long legs on the bottom of the follower. It is easy to remove the follower and file the legs 1/10th of an inch shorter.
If a pin is used, it has to be removed and a new pin installed a bit further down the mag body. (or, remove the pin - remove the follower and file a little notch on the bottom of the follower where it hits the pin.)
I check each new gun I buy to make sure I have the 10 1/2 round capacity needed.
The NP34 does not.
The NP34 has excellent magazines. The blocking was accomplished by punching a dimple in the mag body, so the the bottom of the follower hits the bulge on the inside of the mag. The result is a very hard 10 round capacity. I have seen mags fall out in matches.
To make a bit more room, I drilled a hole in the dimple.
This does nothing to increase capacity. The bulge hits the follower long before the hole. The mag body is made of fairly hard steel. To allow the follower to come down a bit further, I then filed the bulge on the inside. The hole makes filing easier because the material is missing.
I found I had to file down enough material that the edge of the follower starts to appear in the hole. That gives me 10 1/2 round capacity.
I wish Norinco used long legs on the follower. They are easier to adjust and more importantly it allows the follower to come out for proper mag cleaning.
The problem is that some mags are pinned to 10 1/2 rounds, and some are pinned so tight that you can barely get #10 in the mag. It is the latter style mag that has problems.
When you start the match, the slide is forward, so when you seat the full mag, the top round hits the bottom of the action and has to compress the column of rounds a bit, so the magazine will latch. The mag won't seat unless it is hit - hard. If not, it falls out.
With a Glock and a S&W MP9 mag, the mag is blocked with long legs on the bottom of the follower. It is easy to remove the follower and file the legs 1/10th of an inch shorter.
If a pin is used, it has to be removed and a new pin installed a bit further down the mag body. (or, remove the pin - remove the follower and file a little notch on the bottom of the follower where it hits the pin.)
I check each new gun I buy to make sure I have the 10 1/2 round capacity needed.
The NP34 does not.
The NP34 has excellent magazines. The blocking was accomplished by punching a dimple in the mag body, so the the bottom of the follower hits the bulge on the inside of the mag. The result is a very hard 10 round capacity. I have seen mags fall out in matches.
To make a bit more room, I drilled a hole in the dimple.
This does nothing to increase capacity. The bulge hits the follower long before the hole. The mag body is made of fairly hard steel. To allow the follower to come down a bit further, I then filed the bulge on the inside. The hole makes filing easier because the material is missing.
I found I had to file down enough material that the edge of the follower starts to appear in the hole. That gives me 10 1/2 round capacity.
I wish Norinco used long legs on the follower. They are easier to adjust and more importantly it allows the follower to come out for proper mag cleaning.
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