in the opinion of this soldier muzzle down at the low ready is much faster and effective than the muzzle up position with today's modern battle rifle/carbine. regular rifle stocks are faster muzzle up (years of pheasant hunting). just my $.02.
I would suppose that the change also comes from the locations of our wars. muzzle up would be the way to go in the rice paddies of Vietnam but low ready in the streets and alleys of today's battle arena. muzzle up works nowadays too though. just yesterday I pulled rear guard as our patrol made our way through flooded vineyards out in indian country early in the morning. with the M4's in the air, I couldn't help but think of every 'Nam movie I grew up watching!
I would suppose that the change also comes from the locations of our wars. muzzle up would be the way to go in the rice paddies of Vietnam but low ready in the streets and alleys of today's battle arena. muzzle up works nowadays too though. just yesterday I pulled rear guard as our patrol made our way through flooded vineyards out in indian country early in the morning. with the M4's in the air, I couldn't help but think of every 'Nam movie I grew up watching!