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PTW mags are notorious for wearing out their springs on heavy ammo. Even stretching the springs 30% has limited effect.
Ended up getting MAG springs (heh), stretched those 15%, work great now.
Old madbull bios had coating issues, allegedly they left a film on everything. I'm using madbull non-bio .30s to great effect, but would like to use a bio BB. Comes down to BBB .28s or madbulls (don't like green devils).
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