I thought I would jump in here with some info. I recently attended a carbine course by Phase Line Green out here. Now, I admit I am huge Magpul fanboy and I have been running a MS2 and 3 for years now. However, with a 14.5inch AR, I found I was consatntly switching from 1 to 2 point. It became part of my ready drills. Switch to 1 point, check sight, load/ready rifle, press check, load/ready pistol and press check. After the string/engagement was done, I'd switch back to 2 point. I am now going to be switching back to a 2 point sling because that extra step will not be there when I need to make the shot right away. As stated, the MS3 is not long enough to run continually in the 2 point config. It holds the gun tight to the chest, but you will need to slide or unclip the buckle to shoulder the gun. I was using the ASAP plate and RSA loop about half-way down the top rail. Shoulder transitions can still be effectively done with the 2 point, especially with the rear mount on the opposite side of the shooters cheek. With enough slack the gun can be moved over and aimed with the non-dominate eye. Hand position stays the same. Or, drop your left arm out of the sling and move gun to left shoulder while switching hands. All this can be done with practice.
In the end, I will be switching back to a 2 point BFG just like I ran on both of my tours in the 'Stan. Attachment will be on the oposite side of the stock and half way down the rail. I will also have an attachment point at the receiver end plate which will allow the 1 point config if I want. Push button connecters on both ends. One, because I can switch the sling between guns and two, it is easier to dump the gun completely in a casulty sitituation.
YMMV
In the end, I will be switching back to a 2 point BFG just like I ran on both of my tours in the 'Stan. Attachment will be on the oposite side of the stock and half way down the rail. I will also have an attachment point at the receiver end plate which will allow the 1 point config if I want. Push button connecters on both ends. One, because I can switch the sling between guns and two, it is easier to dump the gun completely in a casulty sitituation.
YMMV