Because it isn't mounting right. It probably only fits what's listed (500, standard 590 and 590DA!). I wasn't aware they were so different...? it'll go on but fits way too far rear of the trigger guard.
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AcceptableUserName
July 31, 2009, 08:34 PM
please close this thread, for I am a fool. I had it backwards. I've installed 5 of these things before but never on a Mossberg. We all have our stupid moments I guess.
chevyforlife21
July 31, 2009, 08:36 PM
lol it happens man
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