Tube extension for M1 Super 90

[bigez1]

I am looking for a tube extension for a M1 Super 90. I have a 4 shot tube and would like a 7 shot tube. Does Benelli make these or are there any good after market tubes being made?

 

Thanks

[pup21]

Daves Metal works, tac star, and SRM make them for the M1 I believe. I have a SRM for my M3 and it works but needs to be tightened after every box or so, it flew off once for me to realize this.

[MrMilitaryPolice]

actually if you look around at local shops, you could prob find the factory 4 shot extension with mag clamp and new spring for about $80..well thats what they are around my area when i see them..i have factory extension on mine and its perfect..to me, thats the way to go