well i am in the process of building a xm variant rifle using a superlight bbl. cut down to somewhere around 12.5 and will be attatching a moderator on the end to bring it to legal lengths and wanted to know if anyone has done the same without opeining up the gas port.
i will probably use a bbl. from bushmaster and removing the fsb is a pita, as of right now i am 2 for 3 with bushmaster's fsb and i dont really like the odds. also dont want to go through the hassle of finding a .625 fsb if i have to cut it off. so thats my reason for the question.
also wanted to know if i were to use a pigtail or fatboy gas tube would it simulate a bigger gas port.
thanks as always for any help offered