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The Enhanced, compared to the Standard 555 model, comes with ejectors, engraved receiver and a slightly higher grade of wood - it's also a rebranded shotgun, known in the UK as the KOFS Sceptre XSE - and very popular there.
Now KOFS is a Turkish gun-maker and reviews are very positive - I sure went down a rabbit-hole trying to sort out the local importer names from the actual manufacturers. Interestingly the same shotgun is also known here as the ATI Cavalry - the engraving is different but the gun is the same (and cheaper).