well....ofcourse we know that the real rason for everything..is the budget and annoyance of prolonged shoting.
How can it be explained in SG world. Well may be SGC adapted their gate energy contorl so that there won't be any freezing, or it's may be the clothes they were. And the guns...well they just modified the bullets. And yea 'the head' do protect...but just the face....so all Jaffa get killed in the chest.
I am guessing right?