Born2Lose
Regular Member
For a featureless build your best bet is probably to do what the Israelis do when open carrying their M-16s. Tape or somehow couple the ends of 30 round (if you can do it on shorter ones, then feel free to do that too) mags so it forms a right angle. Stick the unloaded mag in the rifle and the loaded mag should parallel the barrel.
Here's an image which shows what I'm talking about. That's how I'd do it. I imagine the Israeli's carry both mags full, but most open carry M-16 images I've seen have the mags in that configuration.
What is the benefit of doing it this way versus the tried and true verticle mag coupler?