Why don’t you give the F2000 with 40mm Shotgun a shot. It’s good for this map which has mid range and CQB action. I also choose lightweight or the grenade upgrade too with magnum. If you’re engaging more than one target, you can blast your 40mm, quick switch to the F2000 and then quick switch to your m9,mp443 or m1911.

If you still like the Saiga, I suggest dropping magnum and going with the extended shotgun capacity. You have to worry less about reloads and magnum doesn’t add much to this shotgun.