Beretta OptimachokeA(R) XP 12 GA +20mm Extended Choke Tubes Beretta OptimachokeA(R) XP tubes stand up to the heat of competition. Manufactured from high-strength steel, these chokes guarantee significant corrosion resistance and have the ability to withstand the rigors of steel shot. SteeliumA(R) Pro X barrel guns like the SL2 use the new elongated OptimachokeA(R) XP choke pattern for increased ballistic performance. These chokes are NOT compatible with older generation barrel or choke profiles. 12 Gauge +20mm extended OptimachokeA(R) XP choke tube. This choke will extend 2cm from the front of the barrel when installed. Comes with a protective case. Compatibilities: All 12 ga shotguns using OCXP (OptimachokeA(R) XP) chokes. Ex. SL2 Style number: JCTUBE57