Home / Accessory-Stocks / Heckler and Koch (HK USA) FOLDING STOCK SP5K BLACK View cart “SIG SAUER MPX STOCK ADAPTER ASSEMBLY” has been added to your cart. Sale! Heckler and Koch (HK USA) FOLDING STOCK SP5K BLACK$38700 Original price was: $38700.$33784Current price is: $33784. In stock Heckler and Koch (HK USA) FOLDING STOCK SP5K BLACK quantity Add to cart SKU: 261249 Category: Accessory-Stocks Product ID: 60296 Description Description All NFA Rules Apply Related products Sale! SIG SAUER MPX STOCK ADAPTER ASSEMBLY $12999 Original price was: $12999.$11932Current price is: $11932. Sale! SIG SAUER MCX/MPX FOLD/TELE STOCK BLACK $24999 Original price was: $24999.$23223Current price is: $23223. Sale! B&T TELESCOPIC STOCK APC9/APC45 $71500 Original price was: $71500.$66848Current price is: $66848. Sale! SIG SAUER MCX STOCK ADAPTER KIT $17999 Original price was: $17999.$17017Current price is: $17017.