Carlson's Choke Tubes Shotgun Magazine Extension Assembly, Benelli M1/M2/Super Black Eagle I/II/III, 10-Round, Black, 04518

These choke tubes feature a strong mag extension spring a built-in anti-rotation feature and knurled on the end to easily slip into the shotgun magazine tube. With these features plus a strong mag extension spring these chokes are able to extend 10-shot capacity for your shotgun.