Home / Accessory-Barrels / Heckler and Koch (HK USA) THREAD CAP MARK 23 View cart “FN BARREL AR-15 5.56MM 14.5″” 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! Shadow Systems BARREL 9MM FS BRZ FLT TB $23400 Original price was: $23400.$19156Current price is: $19156. Sale! FN BBL AR-15 5.56MM 14.7″ M4 CAR $29900 Original price was: $29900.$27441Current price is: $27441. Sale! Heckler and Koch (HK USA) BARREL VP9 TACT 9MM 4.45″ THRD $27699 Original price was: $27699.$24669Current price is: $24669. Sale! Beretta BARREL 92FS 9MM BLK THD $27900 Original price was: $27900.$19247Current price is: $19247.