Product Description Henning Magazine Spring for Smith & Wesson M&P Extensions Henning Group makes aftermarket magazine springs for several gun models. All our springs are made to high quality and specs that will fit factory followers.
Smith & Wesson M&P Magwell Magazine Extension by Henning MSRP: Was: Now: $44.95 - $65.95 Choose Options
Smith & Wesson M&P 9/40 +6 Magazine Extension by Springer Precision MSRP: Was: Now: $35.00 - $42.50 Choose Options