Yeah, we must have different models. There's no loading lever. I wish it were that simple.
I contacted ProMag and apparently I'm missing a separate, black, plastic, loader device. They were quick to offer to ship me one free of charge. I do hope it makes it easier.
That's what I get for purchasing second hand off of gun broker. Despite the A+ rated seller, tiny parts, no matter how vital, do have a tendency to escape one's mind.
Thanks again for the guidance GunFun. I'll be keeping my eyes out the model you're referring to.