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Which mag?

Definitely not the Magpul, max COAL is only 3.50"

AI, MDT or Accurate Mag - Standard (3.715") mags will allow for 3.625-3.675" COAL, and CIP length (3.850") will allow for 3.750" COAL. Downside to the metal mags is they may require slight tweaking/bending to get them to feed optimally.
 
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I'm using the Accurate Mags, CIP length. Mine feed well. Your mag length needs to match your bottom metal.

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