Owners of the CMMG Resolute 300 Mk4 in 5.7x28mm tend to like the caliber itself: low recoil, high velocity, and enough precision for target work and varminting. The 40-round magazine gets consistent positive mentions from people who want to run longer strings without stopping to reload.
The common complaints are practical ones. 5.7x28mm ammunition is harder to find than .223 or 9mm and costs more per round, which limits how often some owners actually shoot it. A few users describe the rifle as heavier than expected for its caliber. Price is also a recurring topic. It sits above budget AR options, and whether the platform justifies that depends heavily on how much use the 5.7 round gets in a given shooter's routine.
Overall, the community view is that it's a solid, well-built rifle best suited to someone who has a specific reason to run the 5.7x28mm cartridge rather than a buyer looking for the most economical way to shoot.
AI-generated insights derived from customer reviews and discussions on popular gun-enthusiast forums.