These extensions feature an ergonomic shape that allows for better insertion, and finger grooves, allowing the magazine to be stripped from the handgun if needed.
Warne 3306 Magazine Extension Black, +3 (9mm Luger), +4 (40S&W),
Warne 3306 Magazine Extension Black, +3 (9mm Luger), +4 (40S&W), for S&W M&P 9/40
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