2 ROUND BLACK MAG EXTENSION - STEEL - BENELLI M4

81043 FF - FFT Steel 2-Round Magazine Extension Tube for BLACK Original Benelli M4 Shotguns NOTES: Magazine spring and followers sold separately. The FFT / Wolff M4 full-length high power magazine spring is highly recommended for best results cycling loads. I'm always asked - which tube best matches the black shotgun:  It's this tube and the 2 round extension just like it. THE FFT/WOLFF HIGH POWERED MAGAZINE SPRING IS ALWAYS RECOMMENDED WHEN ADDING MAGAZINE CAPACITY OVER 5 ROUNDS. For the Benelli M4 enthusiast who chooses not to go with a full magazine replacement tube, FFT offers the steel magazine extension tube. The FFT steel magazine extension tubes are manufactured with one-piece construction for strength and durability. The steel magazine extension tube is designed to replace the "limiter" that Benelli installs on every civilian M4 tactical shotgun. Adding this magazine extension tube changes the magazine capacity on your Benelli M4 from a 5+1 capacity (5 shells in t