The MK1 11.5" 5.56 Upper Receiver - High Value Upper (Definitely No Bias)
This guide details the assembly and testing of the FocusTripp MK1 11.5" 5.56 Upper Receiver, drawing on the expertise of Jonathan Campbell. It covers component selection, assembly steps, and performance considerations, emphasizing the use of quality parts like Bear Creek Arsenal barrels and Toolcraft BCGs for reliability and accuracy. The process includes critical steps like proper torqueing, thread locking, and live fire testing for tuning.











