Ergo Grip Never Quit Magazine Well Grip for Tactical .223, Black. - Reconfigures the squared shape of the tactical .223 magazine well into an ergonomic and comfortable grip option. - Gives tactical .223 receivers a distinctive aesthetic upgrade. - Easy installation. - Oil and solvent resistant Santoprene construction. - NTOA Recommended. - Made in the USA. This fits .223 tactical lower receivers with a removable trigger guard. It does not fit tactical .223 large frame receivers or receivers with a permanently attached trigger guard.