OBS cycle prob

Patriot

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My OBS MAC10/9mm will not strip rounds off the mag if the mags are loaded over ~20 rds.
I have 4 mags, 2 Cobray, 2 unmarked. They ALL do this. I originally had a prob w/the aftermarket mags not clearing the bolt, but a light touch with a file on the mag catch fixed that.
The springs on the mags are EXTREMELY tough to push down after ~20 rds, and I have not been able to get the spring compressed far enough to load over 30-32 rds for fear of destroying a mag.

Any ideas on how to fix this? Fun gun, but if it doesn't feed, what good is it?

:patriot
 

Patriot

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I forgot to say I polished the bottom of the bolt. I'll try a new recoil spring.

Any other suggestions?

Oh, and right now, there are TWO factory shock buffers installed. It was that way when I got it.
 

gm

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are all the mags interchangable? the reason I ask is my texas mac wouldnt feed cheap and readily available mags, I had to use special warther(cant spell it) made mags..anything else and it wouldnt feed or would fit.
 
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