ɪntˈɜːnəli, ɐn ˈɔɪl spɹˈɪŋ bˈʌfɚ wʌz ˈædᵻd tə ðə lˈoʊɚ ɹᵻsˈiːvɚ tə kəntɹˈoʊl ðə sˈaɪklɪk ɹˈeɪt ænd hˈɛlp ɹᵻdˈuːs fˈɛlt ɹᵻkˈɔɪl.
Internally, an oil spring buffer was added to the lower receiver to control the cyclic rate and help reduce felt recoil.