Best mag tube extension?

[nitro4blood]

Hi,

 

I have a M1 Super 90 with "thanks to a member here" a 18.5 barrel. What would be the best mag tube extension to use? I would like the tube and barrel to be close to the same length. Thanks.

[krecon1]

I have run the factory tube on a M1S90 for many years without issue. If you can find one and if it's within your price range, I'd stick to factory.

[nitro4blood]

How many shells does yours hold? Mine doesnt have the long mag tube. I think my extension is only a plus 1.