7 Inch Stone Krusher Vented Extension For Sig Sauer Mpx Carbine In 1/2x28

7 Inch Stone Krusher Vented Extension for Sig Sauer MPX Carbine in 1/2x28. Our New Stone Krusher Vented Extension offers a new design for the Sig Sauer MPX Carbine 9mm in 1/2x8 Threads. For door breach, defense and barrel counterbalance. Barrel extension is threaded in 1/2x28, finished in flat black anodize, 7 inches in length and weighs about 10 ounces.