I love my saiga 12. I'm not sure it is the best shotgun ever. It is very good for certain things.
what other shotgun can easily carry a 20-30 round drum or a stick mag? dollar for dollar... best shotgun available!
I have a 20 round drum and it is a novelty for the most part. Too big and too heavy for the vast majority of things one might do with a shotgun. Furthermore, for many tasks holding more rounds is not a per se benefit.
You don't NEED at 20 round drum for any civilian purposes or even Police purposes.
Maximum advantage on certain three gun stages? I hate when people presume to tell me what gun things I do or don't need.
I think that some of the conversions tend to result in finnicky guns because the guns are so heavily modified that you're essentially ending up with a completely different gun.
Bingo, if one is going to build a race gun with mid barrel brake then one better know how to tune the gas system or they will have issues.
If you are using aftermarket mags, lots of them take some tuning to get running 100%
If you are running a magwell then again you need to tune your mags to your gun and there can be issues if its not done right.
I've never known a saiga not to run out of the box with slugs or buckshot. Lighter loads do appear to be an issue for a minority of guns. Those can typically be made to run without that much trouble.
In sum, I love my saiga. It is real good at somethings, not so much at others. Far from the best shotgun ever made or a true do it all gun IMHO. I think as a fighting gun or 3 gun gun it can be pretty dang good when set up right.
I will note the MKA 1919 is poised to steal a lot of the S12s thunder IMHO.