PARIS, Nov. 27 — Two years after France’s immigrant suburbs exploded in rage, the rituals and acts of resentment have reappeared with an eerie sameness: roving gangs clashing with riot police forces, the government appealing for calm, residents complaining that they are ignored. Skip to next paragraph A vandalized classroom in Villiers-le-Bel, a northern Paris suburb where violence has flared. More Photos » And while the scale of the unrest of the past few days does not yet compare with the three-week convulsion in hundreds of suburbs and towns in 2005, a chilling new factor makes it, in some sense, more menacing. The onetime rock throwers and car burners have taken up hunting shotguns and turned them on the police.