unless you really plan on useing a 6.5x55 as a close quarters combat weapon or any fire for that matter, a longer than 16" barrel is going to be more usefull and give better performance. 99% of the readers here will never need there AK to have a 16" barrel. They will never be in a close quarters fire fight or do a house clearing. They will shoot a targets or possably game animals. IMOO a 20" barrel is a better choice for 99% of what we use these guns for now. I know they might not look as cool or be as conceiable but if your going to build a fullsize rifle round AK give it at least a 18" barrel or bettter yet a 20" unless looks is the main reason your building it.
DONT WORRY I HAVE SOME MALL NINJA ZOMIE BLASTERS AS WELL FOR THE DAY REDDAWN STARTS AND I HAVE TO TAKE ON ANOTHER COUNTRY LOL. how about a 14" 300 savage pistol