Well wish I had been smart enough to look for a thread like this before buying a 177 barrel for my Crown.
What a piece of junk - FX has to know they have problems with these barrels but they are not standing behind them.
Had mine a couple weeks - cleaned it upon arrival - got it sighted in - wasn't grouping that great - cleaned after about 100 shots.
Shot another 150 - groups were opening up - cleaned again. Was very filthy every time - just considered it as being new.
By this time it's had almost a full tin shot threw it and cleaned at least 4 times.
Went to the Cajun Grand Prix - took a few sighter shots maybe 20 - then 60 shot course - score was horrible - couldn't figure out why was shooting so bad - decided to clean the barrel after the match - had a very difficult time getting the first patch threw was so bad I thought it was going to get stuck.
At this point it had at the most 120 shots threw it. For the next match I only took about 10 sighters and then shot the match - double my score from the day before but accuracy was falling off toward the end. So now we are only talking about 75 shots at the most - below picture of the first patch.
Contacted FX support and they pretty much just blew me off - their advice - shoot a wet and then a dry cleaning patch threw it after ever mag. Really so during a match I need to say hold up - got to clean my barrel. What a joke.
So guess I'm on my own on this - going to lap the barrel - if that don't fix it then I'll make a fence post out of it.
Absolutely no accuracy problems with my 22 cal barrel - its a tac driver.