ɪn nˈaɪntiːnhˈʌndɹɪd nˈaɪnti wˈʌn, ðə wˈɔːlnʌt bˈʌt stˈɑːk ʌvðə bˌiːdˌiːˈɛl dᵻlˈʌks vˈɜːʒən wʌz ˈɔltɚd tʊ ɪŋkˈoːɹpɚɹˌeɪt ɐ mˈɑːnti kˈɑːɹloʊ kˈoʊm tʊ ɪmpɹˈuːv tʃˈiːk wˈɛld wɛn jˈuːzɪŋ ðə ɹˈaɪfəl wɪð ɐ tˌɛlᵻskˈɑːpɪk sˈaɪt, ænd ðɪ ɪmpɹˈɛst tʃˈɛkɚɹɪŋ wʌz ˈɔltɚd tə məʃˈiːŋkˈʌt tʃˈɛkɚɹɪŋ.
In 1991, the walnut butt stock of the BDL Deluxe version was altered to incorporate a Monte Carlo comb to improve cheek weld when using the rifle with a telescopic sight, and the impressed checkering was altered to machine-cut checkering.