Airsoft Sound Amplifier

A fairly simple amplifier device for airsoft guns with 14mm threaded barrels. It should print cleanly without a brim, raft or supports.
This will convert the sound of the airsoft shot from a puff or thud into a higher pitch snap or pop, much like the commercially available versions (madbull/socom gear KX3 and KFH amplifiers). Effects will be different based on how much air the airsoft gun is putting out, and where the barrel ends.
For reference, my test platform has a Woverine airsoft HPA engine inside, so air volume output is slightly higher than on an electric airsoft gun; my inner barrel also ends right at the crown of the outer barrel, which is very close to the optimal distance for this particular amplifier design (optimal is 1-2mm longer than the crown of the outer barrel).

The design is self-threading, add a drop of WD 40 or silicone lubricant on the threads of the outer barrel and screw the amplifier on. The first time will be a bit difficult, but after you remove it and