When looking for the "best quality" semi-automatic .350 Legend, several high-end manufacturers produce premium AR-15 platforms specifically engineered for this cartridge. Instead of standard budget builds, you will want to focus on premium factory models.Premium Semi-Automatic .350 Legend RiflesCMMG Resolute Mk4: Recognized as a premier, high-end AR-15 hunting platform. It features premium upgrades like a Geissele two-stage trigger, an ambidextrous safety and charging handle, and an included muzzle brake to further tame recoil.LWRCI DI .350 Legend: Known for top-tier build quality, this direct-impingement rifle offers exceptional accuracy, an ultra-combat grip, and a highly refined single-stage trigger. It is rugged and incredibly reliable.Wilson Combat Ranger: A true top-of-the-line option built on Wilson Combat's Armor-Tuff receiver. It features a match-grade barrel, two-stage trigger, and flawless internal fit and finish for discerning buyers.A Highly Popular Alternative (Building vs. Buying)Many shooters opt to purchase a Wilson Combat Upper Receiver or a complete upper from Bushmaster and pair it with an existing, high-quality AR-15 lower receiver. This allows you to retain your favorite trigger, stock, and lower controls while seamlessly swapping uppers during deer season

I built my own. Didn't like what others had.

Hi Chester and welcome. There are great quality .350 LEGEND rifles across a wide range of prices. I would recommend three from budget, mid and higher price ranges. https://beta.budsgunshop.com/products/rifles/diamondback-db15-350-legend-5-1-16in-black-174762 -------------------------------------------------------- https://beta.budsgunshop.com/products/rifles/rock-river-arms-lar15m-carbine-a4-350-legend-10-1-16-inch-black-m-lok-713097798 ------------------------------------------------------ https://beta.budsgunshop.com/products/rifles/cmmg-resolute-mk4-350-legend-16-1-armor-black-30-1-rifle-166313 ----------- Cheers, stay safe and enjoy!