Originally Posted by
CroiDhubh
Uh...it's not a hard insert, it's a finesse insert which disengages the slide lock. Hard to explain and I don't know the physics behind it. If you insert it hard, you knock the rounds out of alignment in the magazine and even cause the round to feed incorrectly. I've seen people trying to do it and they ram it hard, only to screw up the rounds and/or have FTF's.
You don't need to slam it in. You kind of roll the magazine into the well while keeping a lot of palm contact with the base of the magazine. The rear of your palm will gently "bump" the magazine as it seats and the slide will come forward. Now, not every gun will do it, so don't force it. If after two or three tries, then stop trying, as you're either doing it completely wrong or your gun won't do it without a lot of force.
I know, right!? I told him to do it with those at home and to practice with them