Airsoft M4 upper reciver
cults3d
m4 upper receiver. make sure and print the free test print dr is on my page to see if it fits as it should. while purchasing this file. the thread in the front is 32 mm in diameter and has a pitch of 1.5 which is almost the standard size of all m4 upper. the printed upper in the pictures is the standard upper but with exactly the same dimensions if this model has. it is only appearance that has changed before screwing the barrel nut on make sure to lubricate the thread first otherwise you may risk that the barrel nut is stuck test print https://cults3d.com/en/3d-model/various/m4-upper-receiver-test-print let me know if you have design queries
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