6 model

Free

Barrel to DC Adapter Holder

Thingiverse

Free

Barrel water pump adapter

Thingiverse

Free

Chinese barrel bung adapter

Thingiverse

Free

Desolator front barrel nerf adapter

Thingiverse

Free

Airsoft WG 1911 barrel adapter 1/4-20

Thingiverse

Free

Ruger 10/22 suppressor, Barrel adapter

Thingiverse