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SD2 - S E F trigger group. Safe, Semi, and Full Auto, but the SEF translates from german words which elude me currently. It is the older group markings. Also has a pistol grip on it, and is not ambidextorious
SD5 - Has a picture for the trigger group. Often call the Navy trigger group. One bullet for semi, a white bullet for safe, and 4 bullets for full auto. the TM MP5-J has a 3 bullet icon for burst fire, but it is just cosmetic. No pistol grio on this one, and is ambidextorios.
They are the same gun, just different grips and firing icons.
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