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which mag spring for m1s90 w/ 7rd mag


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Anyone know the part number for which magazine spring to use on a M1S90 (tactical) with the 4 shot extension? Mag capacity is 7 rounds (of 2.75")


I have a mag spring (benelli p/n 60479 - brownells p/n 301-000-115) but this thing is huge, and not easily compressed. I think its the wrong one.....


Thanks in advance


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Took your advice and installed it. Took 2 of us to get it in there for the first time. After a few minutes after being stalled i could tell it lightened some. 7 rounds loaded in there quite easily then. Not as hard as expected by looking at the size of the spring. :D

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