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stuck pistion

  1. Bolt getting stuck closed, traced to gas piston sticking in gas block

    Troubleshooting
    Nhm 90 took to range and after firing about 250 rounds the bolt starring getting stuck closed. Had to use my metal ammo box top open it. Field stripped didn't see anything obvious. Fired more but kept getting stuck had to call it a day. Took apart at home and found that the gas piston is...
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