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The dimensions given for AICS mags are the outside dimension that fits the mag well. You can only stuff a COAL of about 3.47 to 3.48” in a 3.56” mag….and that dimension may or may not run up the feed ramp for some bullets.1. Trigger. 2. LA mag max COAL 3.56. 3. Smallish barrel tenon may find pressure early on bigger magnums. 4. LA stock/chassis options.