4 hours International - Domestic transfer at Beijing Capital Airport

I will be flying from London - Beijing and then from Beijing - Changchun. Ideally i dont want to wait around the airport for hours and hours. There is a flight to Changchun 4 hours after my plane lands in Beijing. Do you think this will be enough time to collect baggage, get through immigration etc, get to the other terminal and check in again with baggage? Have a choice of either a 4 or 6 hour wait at the airport. not entirely sure whch to go for atm. any info would be greatly appreciated!