40 rnd ar mag by magpul - Magpul Industries PMAG GEN M3 AR-15/M16/M4 .223 Remington 40 Round Rifle Magazine

None better. 10, 20,30,40 Hands down the best magazines made. I had mags that had been loaded for over a year with green tip garbage because that was all I could get during the pandemic. While changing out the rounds by firing or manually stripping them out the Magpul magazines were the only ones to perform flawlessly. Don’t put your butt on the line with cheapo ammo or mags. Buy Magpul everytime.