Home / Accessory-Barrels / Heckler and Koch (HK USA) THREAD CAP MARK 23 View cart “Shadow Systems BARREL 9MM CPT BLK FLT TB” has been added to your cart. Heckler and Koch (HK USA) THREAD CAP MARK 23$3099 Only 1 left in stock Heckler and Koch (HK USA) THREAD CAP MARK 23 quantity Add to cart SKU: 970174 Category: Accessory-Barrels Product ID: 41553 Description Description Related products Sale! Springfield Armory XDM 9MM 4.5″ THREADED BARREL $15999 Original price was: $15999.$11882Current price is: $11882. Sale! Heckler and Koch (HK USA) BARREL VP9 TACT 9MM 4.45″ THRD $27699 Original price was: $27699.$24669Current price is: $24669. Sale! FN BBL AR-15 5.56MM 10.5″ M16 CAR $29900 Original price was: $29900.$27441Current price is: $27441. Sale! Springfield Armory XDM 45ACP 4.5″ THREADED BARREL $15999 Original price was: $15999.$11882Current price is: $11882.