Trulock Choke Tube EXTENDED BLACK OXIDE FINISH BERETTA/BENELLI TRULOCK DEERSTROYERÖ 12 GA SPECIAL TDBER12SPL Deerstroyer™ Choke Tubes At the 2015 SHOT Show we introduced our Deerstroyer™ style of choke tubes especially for 00 and 000 buckshot sizes. All of these are made in a 4 inch overall length. For 2016 we have redesigned this choke internally for improved pattern performance. All of the Deerstroyer™ chokes have a nominal .030 constriction based on average bore size for each specific model.