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I've searched through pages of threads here and I'm sure this information has to exist, but I either missed it or my search skills have failed me this week. I purchased an M2 tactical and I just added a Nordic +3 mag extension. It's very well made and I'm quite impressed with the fit and finish of their machine work. However, they suggest cutting the spring down to be between 10 and 16 inches longer than the mag and extension combined. I started at 18" and worked down to 10" and I am still only able to get 6 and "3/4" rounds of 2 3/4" 12 ga ammo in the tube. I tried both the factory M2 fo