semi auto 20 gauge with 8 +1 capactiy or ability to upgrade? (tube fed, not magazine)

[chrismshanks]

looking to get some knowledge

want to look at and consider buying a semi auto 20 gauge that has a 8+1 capacity with a tube or at least the ability to be upgraded with merely 'bolt-on' aftermarket parts... plug and play so to speak


I am trying to be budget minded, but either way, I am very interested in broadening my knowledge & options

any help is greatly appreciated

 

[browncoat]

Moss berg sa20 has extension tubes available. There are more options if you look at pumps