I have this gun and have personally ran tests, on HNM and normal monsters, the Quick Draw damage translates EXACTLY the same as Coffinmaker, which is 1 base damage less the Corsair's Gun. So unless you augmented your Corsair's and got MAB, it comes down to whether you want 5 macc or 1 base dmg. Personally, i LOVE this gun for HNMs.
Thats magic attack? 0.0 shouldnt it say MAB+5? I dont see this really for use unless /whm like Kvazz stated and you really need the macc. The Magic attack+5 has me like 0.o