Exceptional magpul quality as usual - Magpul Industries PMAG LR/SR GEN M3 Magazine, 7.62x51mm NATO

Probobly the best plastic mag available,promag is ok depending on your lower but you have to file down the front portion like 1/4 inch so the bullet can feed into the chamber without the lip of the case getting caught up on the mag, they also fit really tight for most lowers wich i dont mind too bad, you could sand the top dwn to get em to drop freely. Magpul mags are allot lighter to, and just as strong as heavy nylon ones and thee antitilt is hands dwn the best, and if you buy from opticcs plannet theyy cost the same as promag, its a no brainer