Home / Accessory-Barrels / Heckler and Koch (HK USA) THREAD CAP MARK 23 View cart “FN BBL AR-15 5.56MM 14.7″ M4 CAR” 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 Walther Arms BARREL Q5 SF 9MM 5.5″ THREADED $24900 Sale! CANIK BARREL TP9 SF 9MM BLK TB $9599 Original price was: $9599.$8299Current price is: $8299. Sale! SilencerCo BARREL GLOCK 23 40S&W 9/16X24 $16900 Original price was: $16900.$14408Current price is: $14408. Sale! Shadow Systems BARREL 9MM CPT BLK FLT TB $23400 Original price was: $23400.$19156Current price is: $19156.