bko 03 zenitram asa, tickler lpr, ergo reg, vapor blot, j&j 2 pc barrel, aka mity max,
gets rid of stock lpr
lets you add any after market reg
this is a very ncie product. i didn't realy like the stock lpr on the bko and this lets you upgrade to a diffrent lpr. and it lets you add any after market hpr. if you add this to your marker and change both reg you will see a big diffrence in the proformance in your bushmaster. pluse if you get a lpr that you can ajust by hand it makes it make easier to chrono.
this is a very good product for bko owners i highly recomened it and its only like 35 or 40 dollars.