Does anyone know where to buy an Escort Gladius 20 gauge semi automatic shotgun that holds 7 rounds?

http://www.hatsan.com.tr/en_escort_gladius_mpa20.html

The link here, directly from their website, says there's a variant available with a 20" barrel that holds 7 rounds, but I have not found one anywhere. If someone knows, I'd greatly appreciate it. Thanks in advance!