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ODA 226
I am not a LEO or a MIL, and have very limited experience with automatic weapons. So take this information for what it is worth.
I purchased a NFA Bushmaster lower more than 20 years ago. It ran for a time, and then developed the identical problem you describe – 3 or 4 rounds fired full auto and then a light primer strike on the 4th or 5th round. I tried everything, and was never able to fix it. I finally just put the rifle away. It’s now the oldest safe queen I own.
I went shooting with Team Sergeant last year. While shooting, I asked TS if he had any suggestions to the problem. He gave me a standard buffer and spring from a rifle he changed to a collapsible stock, suggested I clean the rifle, lubricate it well and shoot it. He stressed that cleaning and lubricating are important.
His ideas worked. I ran 3 mags through the rifle the first time, and about 10 more since. Ammunition is too expensive to shoot more, and tell the truth, shooting it semi is more enjoyable. When I was single, it did have its appeal though.
I don’t think changing the standard buffer or spring had much to do with the remedy, as I’d changed them before. I do think the cleaning and lubricating the heck out of the it had everything to do with it. I really used a lot of Slip 2000.
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