ðə θˈɜːd lˈʌɡ ʌvðə θɹˈiː lˈɑːkɪŋ lˈʌɡz loʊkˈeɪɾᵻd æt ðə fɹˈʌnt ʌvðə bˈoʊlt ˈækts æz ɐ ɹˈeɪl wˌɪtʃ ɡˈɪvz ðə bˈoʊlt ɐ fɹˈɪkʃənfɹˈiː ænd smˈuːð mˈuːvmənt.
The third lug of the three locking lugs located at the front of the bolt acts as a rail which gives the bolt a friction-free and smooth movement.