Do NHM 91 bolt, firing pins and/or carriers have a reputation for soft steel?
I recently bought a lightly used NHM 91. I took it shooting today and couldn't get through a magazine without several fail to fires. I'd say that every 3rd round or so failed to fire.
I also brought a Century Yugo M70AB2. I bought this also used but in good shape. I had no FTF's with the Yugo.
I compared the fired Yugo brass to the NHM 91. To my eye, the Yugo firing pin strikes are deeper than the NHM 91. The light primer strikes below are on rounds that did not fire.
The ammunition was Wolf but I also had some Golden Tiger and had the same problem with light primer strikes with the NHM 91.
I am also posting this in the general AK section, but I am trying to determine if the NHM 91 is known for soft firing pins, bolts and/or carriers, so hopefully the mods don't delete it.
I did find this in a search for my problem. I'm simply copy/pasting it and don't know if this is generally true or not:
Link
They have a heavy barrel. For some reason the NHM-91 bolt and bolt carrier are soft. They have some mods that weren't required but they were to prevent full auto conversion and using military magazines. The worst part is the rear of the bolt and firing pin are ground down shorter than standard. Then the hammer has a step in its face to prevent it from firing full auto by removing the disconnector. It's possible the firing pin shortened only to make it lighter weight to prevent slamfires but the hammer is modified to mate to the shortened bolt. The receiver had a rivet in it so military magazines wouldn't fit and only the original 10 round magazine would fit.
The buttstock on that one is a cut off thumb hole stock, not an original RPK stock. The metal parts are the worst part of the NHM-91's. they just aren't up to even the Chinese standards of the other AK's. It's a heavy, awkward AK that takes unique parts and even replacing them with other Chinese AK parts, they seem to fit oddly. They can be enjoyable but I wouldn't pay near that much for one. The adjustable bipod legs don't hold their positions tightly either. They collapse when only hand tightened and are dented and damaged when tighten tighter with tools. To me, a MAK-90 is a better deal without the problems.
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In this thread, I would like to know if this is a known problem with NHM 91's?
Yugo left, NHM 91 middle, and the right is a Golden Tiger round likely with only the firing pin mark from chambering it:
Yugo on the left, the other 3 are NHM 91:
Yugo bolt face left, NHM 91 bold face right: