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51689 has the internal +4 shell holder stock while 51671 has a regular stock.

Paul, they have two different stocks. 51689 (Speed Stock) here : https://www.mossberg.com/product/590a1-class-iii-pump-action-6-shot-51689/ -------------------- 51671 (Standard Stock) here : https://www.theshootingstore.com/single-product?product_id=217556&ref=product

The pictures buds uses are stock photos and shouldn't be taken as accurate representations of the actual firearm being sold. You can always verify the model being sold by Google the upc code 015813516716 and in this case it comes back 51671 , mossberg has put out a lot of shotguns over the years and the number of models listed on their website is limited, its frustrating sometimes when you are looking into buying one and the manufacturer has little to no info about it on their site, but the upc will almost always get you a decent amount of info.