Hatsan mag tube question

Rocket Surgery

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I'm confused over this statement that Hatsan has about their shotguns:

"Magazine Capacity: 7+1 rounds in 20"/51 cm barrels, 5+1 rounds in 18"/46 cm barrels. "

How does taking away 2 inches of barrel reduce 5.5 inches of magazine tube? Is this actually correct? Does the mag tube on the 18 inch version only go most of the way to the end of the barrel while the 20 inch version the mag tube runs to the very end?

Thanks
 
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