As far as the taking it apart comments go, it's not bad at all. Yes the 870 is simpler but not by much. It's a pump shotgun, they really aren't that complicated of a beast. I certainly wouldn't let that put you off the gun. It's a great pump.
Not to me and many ,many others. Your comment " Yes the 870 is simpler but not by much" Yes sir I agree the apart is simple the back together is the bear
Well no where in my 870 owners manual does it say anything like this
DO NOT TAKE YOUR GUN'S ACTION APART. This is a specialized,
finely fitted mechanism; and you may mar it for life by an attempt
to remove the inner mechanism. It is unnecessary, and may do
damage to the inner mechanism, to disassemble it for routine
cleaning and oiling. Of course, misfortunes (such as dropping
your gun in water) require appropriate attention, and in such
circumstances we recommend you immediately take your gun
to a competent gunsmith.
Nor on the largest shotgun form out there did they get a gunsmith to put together some tips for my 870 to help members having problems with BPS , just google it page and pages of those struggling
Nor was so many frustrated with the BPS that a gunsmith actually designed a special tool for assembly which brownells now sells
http://w w w.brownells.com/gunsmith-tools-supplies/shotgun-tools/shotgun-specialty-tools/browning-pump-shotgun-assembly-tool-prod23982.aspx?ttver=2
Like I said I would not stop buying one because of it but sure take my time or ask for help especially the 1st time doing it. One in 1000 will fall back together after the trigger is out which maybe you have and be thankful since it is not the norm. That or you are special with three hands which is what is required or there is more wrong with the gun than a bulged barrel. Have you checked it against a parts list / drawing to make sure everything is there would not be the 1st time I have seen that??
Good luck with the barrel fix should be just fine.