Premium AR-15s in .350 Legend are still rare, and most that exist are rebarrelled 5.56 uppers with mismatched components. The CMMG Resolute Mk4 is the opposite — a ground-up straight-wall build from CMMG's Missouri plant in Boonville, with house-brand ZEROED trigger, ambidextrous safety, and muzzle brake installed at the factory. That positioning matters in the .350 Legend AR market, where the alternative is usually a budget rifle like the Bear Creek BC-15 with a MILSPEC trigger and Parkerized finish.

The 16.1" 4140CM barrel uses a 1:16 twist — standard for the .350 Legend's heavy 150-180gr deer loads — and is finished in Salt Bath Nitride for corrosion resistance under field conditions. The EML15 M-LOK handguard is CMMG's free-float design with M-LOK slots at the 3, 6, and 9 o'clock positions for lights, slings, and bipods. The RipStock adjustable polymer buttstock and 6.1 lb total weight keep the rifle balanced for offhand shooting at typical .350 Legend deer-woods distances of 50-150 yards.

Where the Resolute Mk4 separates itself from rebarrelled budget builds is the ZEROED 60/90° ambidextrous safety and ZEROED Drop-In trigger. The 60° throw cuts thumb travel for faster off-safe transitions, and the ambi controls (safety, charging handle, mag catch) suit left-handed shooters who otherwise pay aftermarket money to convert a standard AR. Owners and reviewers consistently note the ZEROED trigger as a meaningful step up from MILSPEC — closer to a mid-tier aftermarket drop-in than a stock unit.

The trade-off is real: this is a premium-priced AR for a role most hunters fill with a budget bolt rifle like the Ruger American Ranch. The Resolute Mk4 makes sense if you want fast follow-ups on running deer or hogs, ambi controls, and the AR ergonomics you already train with — not if you just need to put one round into a deer's shoulder once a season. AR-15 .350 Legend rifles also need caliber-specific magazines (ASC, DuraMag, and Magpul make them); standard 5.56 PMAGs do not feed the larger straight-wall case.