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