AICS 223 mags?????

I run Accurate Mag .223 10rd AICS pattern mags in my Tikka .223 in a KRG Bravo chassis. Runs great, feeds very smooth.
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I have a bunch of genuine AICS 223 mags, and they are garbage. Bulging, barely fit in bottom metal, spreading feed lip pieces of absolute garbage.

Get the Accurate mags, and mill out the front lip for more room. Or buy the MDT's.
 
Accurate are great. Sometimes you can find them cheaper labeled/sold as ruger 223 scout rifle mags. That is if you don't mind having the ruger screaming chicken on the bottom of the mag.
 
I used to run genuine AI 223 mags... the first ones I ordered years and years ago right when they started offering them are still holding together and work great after 10k+ rounds through them, never an issue with them. Some later batch ones I purchased right before AI discontinued them have already split at the seams-- I had to epoxy them back together.

Accurate 223 mags worked great in my 223AI Tikka T3, very smooth and reliable and easy feeding. Take a rat tail file to the front of the liner to get another .080" or so of OAL. However, they won't run in my new 223AI Nucleus build; on a couple of the mags the bolt runs over the round without stripping it, and on the others the tip of the bullet jumps to the 12 o'clock position on the breech face of the barrel and stops up the bolt when the feed lips release the round. I may need to do feedlip tweaks, hopefully the plastic liner will "follow" the recontoured feed lips.

MDT mags run without mods in my new 223AI Nucleus, but the first 4 rounds out of the magazine are very difficult to strip and require a *lot* of effort on the bolt handle. I need to look into that as well.
 
Box stock Howa 1500 in a KRG 180-Xreay stock. Every mag I've ever bought for it has worked from the get go without any need for modification: Magpul, Alpha, MDT plastic, MDT steel. Doesn't matter how hard I pull back, push up, or push fwd on the mags, they all work all the time.

The MDT steel mags were super rough feeding the first few rounds due to the feedlips, but never once did they ever NOT feed.