I have the O PAP and it is excellent! Much more heavy duty than my GP 1975, as it has the RPK receiver which is about .5 mm thicker than on the N PAP. The big difference is that the O PAP is stronger but heavier and the stock is not for customizing as it is solidly bolted to the receiver and does not have the usual tang at the rear of the receiver! I love my O PAP,but if you are looking to sporterize it I would get the N PAP, if you want solid wood furniture go with the OPAP! Both are good AK's, but the O PAP is very heavy duty!!!