Home / Accessory-Stocks / SIG SAUER MCX STOCK ADAPTER KIT View cart “Heckler and Koch (HK USA) FOLDING STOCK SP5K BLACK” has been added to your cart. Sale! SIG SAUER MCX STOCK ADAPTER KIT$17999 Original price was: $17999.$17017Current price is: $17017. Out of stock SKU: 2401191-R Category: Accessory-Stocks Product ID: 29526 Description Description Related products Sale! Heckler and Koch (HK USA) FOLDING STOCK SP5K BLACK $43899 Original price was: $43899.$38167Current price is: $38167. Sale! B&T TELESCOPIC STOCK APC556/300 $71500 Original price was: $71500.$66848Current price is: $66848. Sale! SIG SAUER MPX STOCK ADAPTER ASSEMBLY $12999 Original price was: $12999.$12618Current price is: $12618. Sale! Heckler and Koch (HK USA) VP9 MATCH OR LONG SLIDE $59999 Original price was: $59999.$52266Current price is: $52266.