Twentyfootdaredevil
Sharpshooter
Regardless of brand of 1911 you pick, magazines will
Be the largest source of failure. Whatever comes with the gun you buy, pitch might not be true with sig, time will tell. Get chip McCormick power mags, Tripp research mags, or Wilson combat mags.
I agree that there are several 1911 mags out there that are junk. Before you throw a mag away because of the brandname first try to figure out what makes a "good" mag.
Do your research and see what a "good" mag should look like.
First the shelf should be parrallel to the top of the follower. If this isnt the case fix it instead of throwing it in the trash.
Second check the feed lips to see if they are bent or out of spec in anyway. You can bend them back with pliers or file them alittle.
Third check your spring. If it is weak or kinked you could replace a spring pretty cheap.
Fourth check the specs on the shelf and follower to make sure they are bent and spaced correctly.
By knowing how to check your mags and fix them with a set of pliers and a slotted screwdriver makes you a better prepared 1911 owner.
All this being said I should mention most of my mags are CMKs and I have tinkered with 100% of them.