M590A1 +2 mag extension issue ?

boss351cleveland

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Hi i installed my +2 extension and it wont quite hold 7 2 3/4 shells , almost though ? in the package there was a mag tube and spring but no follower ? im using my factory follower . What could be the issue ? is the spring too big or factory follower too big? Any suggestions would be great cheers thanks..
 
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