WE G39 magazine feed lip
thingiverse
UPDATE: the v2 is slightly tighter and will reduce the chances of double feeding if your hop assembly is wobbly as hell Feed lip for the WE G39 also called the WE 999 sometimes This isn't a perfect 1 for 1 replication but it fits, feeds, and doesn't have any double feed or jamming problems. I recommend printing at .12 layer height or less for FDM with supports and a roof. leave a good support Z distance otherwise cleaning this thing is a PITA. do NOT print in PLA, it will wear out eventually. Airsoft bb's are harder than PLA PLA+, PETG, some versions of silk PLA, and ABS are all fine to use.
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