PTS 120rd EPM Mid-Cap Enhanced Polymer Magazine For Systema PTW M4 M16 Series Rifles Airsoft BlackPTS 120rd EPM Mid Cap Enhanced Polymer Magazine For Systema PTW M4 M16 Series Rifles Airsoft Made out of Dupont Zytel High Performance Reinforced Polymer For those who don't like the low capacity standard AEG Magazine, but yet hate winding and the rattling from High Capacity Magazine 120 rounds of loading capacity are enough for most competition & skirmish airsoft game No more Plastic Bullet shaking which essential for intrusion during airsoft combat