NEW MK48A1 7.62 BOLT CARRIER/SLIDE ASSEMBLY. PN# 49022L.  MK48A1 SLIDES ARE NICKEL BORON. THESE HDD DESIGNED SLIDES ARE MUCH STRONGER THAN STANDARD FN MK48 SLIDES AND WERE MADE IN RESPONCE TO US SOCOM REQUIREMENTS TO IMPROVE THE MK48 PLATFORM. MARKED 8BZD1. THIS SLIDE WITH A HDD MK48A1 MATCHING BOLT TOGETHER WILL FIT A STANDARD MK48.