hello Ken
yes it's a 20" bar and no problems with this , it's even better because more nevrous , the tree that' i cut ist "hard" , the wood is hars like oak
generally i work with the 372 XP and I place either an 20" bar or 24 "
i have also 395 XP with 40 " bar and also no problems ( but generally i work with an 28 " )
really depends of the configuration of the tree , the area working and other factors....