Looking to have a bolt carrier modified to MCS Specs? Simply order that service here! Our bolt carrier modification process typically takes 1-2 weeks and is done by one of our local machinists who has modified well over 1000 bolt carriers for our customers. BCG'S CAN BE SHIPPED TO: DFA LLC BCM Program W1777 Alpine Road Brooklyn, WI 53521 BOLT CARRIER FINISH: After Modification, DFA will finish your bolt carrier with Cerakote Microslick. We will touch up the reduced end of the bolt carrier with Cerakote Microslick for wear protection and a smooth finish. Micro slick is a product designed for improved BCG performance and is much easier to clean. Learn more about Cerakote Micro slick at here. Questions? Just shoot us an email to email@example.com and we will be happy to assist!