http://www.guns.com/usfa-zip-zipfact...ear-11387.html
Sounds interesting and at $200, if thats what it really sells for, its pretty cheap. However, it seems a little gimmicky. And with swapping out the sights (top rail), I kind of wonder what kind of accuracy it has.
I for one definitely do NOT see a member of SWAT throwing one on their SBR and using it as a backup to their main weapon.