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
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