I can't say anything about that particular model but in general all the Sentry safes I have seen in person have been flimsy and poorly built.
I bought one of the Winchester safes they sell at Sam's Club around hunting season. It holds 20-ish long guns and has a digital key pad (important for me as standard combo locks confound me). I think it also has a fire rating and water submersion rating, can't remember what though. It's not the best but it would take some determination to get into or move. You can also bolt it down. I want to say it was around $525.
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