Originally Posted by EW1066
Is it in the way when not in use? It seems like it would block your weak eye view.
If it works for you great, but it would bug the snot out of me.
ETA: just saw the ambi mag release...are you a lefty? If so that would explain that configuration.
I usually just shoot paper at medium distance, so I almost always use the magnifier. It's mainly a high dollar plinker. It would definitely block weak eye if I ever used it without the bipod. The magnifier replaced a MagPul MBUS that absolute co-witnessed nicely with front sight post. As far as being a southpaw, no. All the Sig M400s are ambi IIRC. Not really a problem unless you plan on using the MagPul BAD lever. I hear that requires some creative file work.