ðɪs vˈɛntʃɚɹi tˈuːb fˈʌnəlz ɡˈæsᵻz fɹʌmðə pɹəpˈɛlənt ɹˈɪɹwɚdz ænd ˌoʊvɚ ðə ʃˈuːɾɚz ʃˈoʊldɚ, sˈɪmɪlɚ tə ðæt əvɚ ɹᵻkˈɔɪlləs ɹˈaɪfəl.
This venturi tube funnels gasses from the propellant rearwards and over the shooter's shoulder, similar to that of a recoilless rifle.