I'll get right to the point. Look in the mag well. You'll see the the spring steel rod connected to the mag release button. It pushes a small catch back & forth, that slips into the notch of the mag. Extremely simple! All most everyone should be able to see if there is a problem here. I believe that most Shield owners should already know what the exact problem is, or isn't, before writing their complaint.

Same thing happens on the AR forums. Especially where owners try building their own weapons. Some don't have a clue about what's going on, and don't take the time to find out. It's just complaint city.