Over the past 15 – 16 years I have been building up a stockpile of AR-15 magazines. My buddies and I would go to various gunshows where I would buy various AR mags.
Then I realized a lot of the AR-15 magazines I been buying were junk. Either the followers would stick, or the feed lips were bent. When I replaced the followers of GI mags with anti-tilt P-mag followers, I had to cull several magazines.
One day a buddy of mine who served two tours in the middle east told me how much he liked P-mags. I took him at his word and bought some. Lets just say I was impressed right off the bat.
From now own, all I am buying are P-mags. I see no reason to buy gunshow surplus aluminum AR-15 magazines that I am either going to have to fix, or cull if the follower sticks. Even if the gunshow surplus magazines work, the factory follower will have to be replaced with P-mag anti-tilt followers anyway.
If I am going to spend the money for surplus magazines, then buy the anti-tilt followers, why not just buy a new P-mag to start with?