Spear Mags

Any one using them for a 300 BLK

Do they function well

I have one on mine and yes it functions OK, feeds and locks open, its done about 100 rounds. However the lips look like they are "stressed" or slightly sprung open . . . I prefer my "Israeli" mag

A ELander??

I have used them broken 3 the lips seem to crack

Ive tried one, it feed ok with everything from heavy cast subs to 150gr to 110gr RN cast projectiles intended for M1 carbine - the only mag that will feed short blunt nosed rounds like that. Pmags/steel mags/lancer/ally wouldnt feed them reliably.

Im not highly impressed with spear mags overall, they feel a bit cheap, but they did work for that purpose at least