Biggest thing with a mag is to lube it at the beginning of the day. Disconnect the QD at the valve, 3 drops of oil, remove the barrel, fire about 10 times, reinstall barrel and done.
If you've never shot a pump mag before. You need to make sure you let the handle fully come forward before you shoot. If you don't the bolt will hit the cocking rod and will probably cause you to double feed and possibly have a barrel break. It takes some practice but you'll get use to it.
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