Irons Man
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I have an HK M1S90 I want to find a mag extension that wil most closely fit or match the length of my 18 inch barrel Do I need a +2 extebsion or +4? My gun does not have the plug in it I assume that the +2 wil bring me to 7+1 mag capacity Is this rght? WHere can I get one, I know they are now expensive but I will pay anyhow