How do I load nails into the SB-1664FN?
Pull the follower back until it latches, then insert nails into the track of the magazine. Once nails are inserted, press the pusher release to disengage the follower so it feeds the nails forward. Do not pull the trigger or depress the trip mechanism while loading the tool.
From the official Bostitch SB 1664fn manual, page 8
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