ˌeɪtʃkˈeɪ nˈaɪnti wˈʌn ˈeɪ fˈaɪv: ɹᵻtɹˈæktəbəl wˈʌnpəzˈɪʃən stˈɑːk, sˈɛmaɪˈɔːɾoʊ "sˈiː" ɔːɹ "zˈiəɹoʊ dˈæʃ wˈʌn" tɹˈɪɡɚ ɡɹˈuːp ænd sᵻlˈɛkt pˌɑːlˈɪɡənəl bˈoːɹ.
HK91A5: Retractable 1-position stock, semi-auto "SE" or "0-1" trigger group and Select Polygonal Bore.