I have an older model 721 rifle chambered in 30-06 that I have been itching to use for a build. My question is in regards to the action and it's compatibility with Remington model 700 parts (barrel, trigger, stock etc.) I know the 721 was the predecessor to the 700, but how interchangeable are the parts? if at all... Any input on the matter would be greatly appreciated. Also, I'm looking to use the action and rebarrel in 6.5-06. any forseable problems I may run into? Thanks in advance for any light shed on this issue.