3d printed Barrett M82 airsoft test (gbb)

I am developing a GBB model of a Barrett .50 BMG rifle. It uses Tokyo Marui Glock magazines and an MWS inner barrel. There are two different muzzle brake designs and two barrel length options available. Both firing performance and cycling reliability are quite good, and I plan to sell it once development is complete. Although it runs on 14kg gas, HPA is recommended for more stable and reliable operation.