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040603201 Samson Manufacturing: The +1 Magazine Extension from Samson Manufacturing not only grants the advantage of additional ammo capacity but greatly improves malfunction clearance. Its design ensures a snag-free release, avoiding contact with the shooter's hand. The leading edge is ingeniously shaped to support one-handed reload and function as a comfortable finger groove. Additionally, the magazine extension boasts relief cuts, enhancing magazine extraction for malfunction clearance, while utilizing the stock magazine spring. The accompanying replacement base plate retainer ensures reliable feeding utilizing the standard magazine spring. This version features a sturdy black hardcoat anodized finish and is specially designed for compatibility with S&W M&P Shield 9/M&P Shield 9 M2.0.