madcratebuilder
Member
As I mentioned, I've seen at least a few that took the use of a pipe wrench (and a cheater bar) to get them loose. I just figure that on some, they have to really over torque the nut to get everything to line up for the gas tube and when you combine this with a failure to use any sort of anti-seize compound, you could have a problem.
Do not use anti-seize on the barrel nut, it causes corrosion. Use moly grease as specified in the 23&P. Do not use grease with graphite in it either. A pipe wrench to remove a barrel nut is OK if the nut is already fubar, but a serviceable barrel nut can be easily removed with a good quality barrel nut wrench. Like the ones PRI sells.
I believe it is common to remove the FSB and FH to change barrels, but it's not necessary if you're going to reuse the existing barrel nut and delta ring assembly.
Agreed, but this was a upper only change, no need to touch the FH or FSB. This should have been a under one hour job.
Please excuse my incorrect vernacular. I mean the...flat sides on the flash hider that one can use to take it off (unless its permanently attached of course).
If this so called 'gunsmith' rolled the flats on the FH it's probably pinned and welded. This may have damaged the barrel. A screw on FH should come off with light pressure from a wrench. The FH is not torqued on that tight, it should have a peel washer or crush washer behind it for clocking if it's requires clocking, ie birdcage or phantom style.