Depends on how much blasting you intend to do. If this will be a once in a blue moon type of thing then any gun you can find will probably suffice. But, if you plan to do this even moderately often get a cabinet. HF has several cabinets around $100 last time I looked (been a while). The cabinets come with a gun and siphon system and will keep your sand inside and less on you and your shop. Wear your respirator anyway, even with the cabinet sealed up you will still easily smell airborne sand and that is something you really don't want to do for long. Very bad for the lungs ....
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