Magazine Extension +4 for S&W M&P9 Shield

FAB Defense Magazine Extension +4 for S&W M&P9 Shield MPS-12 M&P®9 SHIELD™ +4 Magazine Extension The MPS-12 allows modifying the original 8 round magazine of the M&P Shield into a full capacity 12 round magazine, all this without having to replace the original magazine spring. Advantages: + 4 rounds for a total of 12 rounds in the magazine! Innovative spring plate design, allows for the use of the original magazine spring Enables a full grip on the handgun Contoured finger indents for a firm grip during magazine manipulation Easy installation, no Gunsmith required Fiberglass reinforced polymer construction Available in black. Compatibility: 8 Round, S&W M&P®9 SHIELD™ - original factory extend capacity magazine only!