And in the third video, that looks amazingly like an arm that goes flying off to the left.

It can engage targets to 2,000 meters with precision.

According to Operation Iraqi Freedom PEO Soldier Lessons Learned [LTC Jim Smith 15 May 2003] "The Barrett 50 cal Sniper Rifle may have been the most useful piece of equipment for the urban fight – especially for our light fighters. The XM107 was used to engage both vehicular and personnel targets out to 1400 meters. Soldiers not only appreciated the range and accuracy but also the target effect. Leaders and scouts viewed the effect of the 50 cal round as a combat multiplier due to the psychological impact on other combatants that viewed the destruction of the target.

“My spotter positively identified a target at 1400 meters carrying an RPG on a water tower. I engaged the target. The top half of the torso fell forward out of the tower and the lower portion remained in the tower.” 325th PIR Sniper

"There were other personal anecdotes of one round destroying two targets and another of the target “disintegrating.”