First of all, you must have Provisional/Full Residency and Cedula if you are a foreigner. Anyone selling you a "legal" firearm must have a VALID Dominican Firearms Permit which shows the make, model and serial number of the firearm you wish to purchase; the annual tax for the permit must also be up-to-date. Make sure the individuals license isn't expired, because he would have had to turn in the firearm if it was, and definitely check if the tax was paid. BEFORE you pay anything, copy down the serial number and run it through the Ministerio de Interior y Policia website! If all looks good, take it to a place and shoot a few rounds to see if it works to your satisfaction and doesn't jam up on you! Then if you think you have a good deal, go to a well known lawyer's office and get a notarized "Bill of Sale" with seller and buyer info, make-model-serial number etc. then head over to a local gun store with the seller and tell them you want to do a "Traspaso de Arma" and they will do the rest of the paperwork for your license for about RD$20,000. At some point both you and the seller MUST go the Ministerio de Interior y Policia in Santo Domingo. Here the owner of the firearm you are buying from surrenders both firearm and his Permit to an official and it remains there until you pick up your Permit. You will be required to get a good conduct certificate from the Police, photos, urine test for drugs, psych exam and shoot a round or two. It usually takes 20 business days to get your Permit. Hope this helps and good luck!