Aging in a keg before bottling.

I have a few kegs sitting around while I'm gathering the rest of my kegging equipment. I'd like to secondary bigger beers in my kegs then bottle. If I transfer the beer to kegs do I need co2 to seal the lid or can I just put the lid on and let natural co2 build up. I would then age the beer a few months then transfer to a bottling bucket to bottle. Or is it just easier to invest in a beer gun.

 

you will need co2 to seat the lid.

 

Yeah, invest in a beer gun...it seems like a waste of time going into the keg and then out again to bottle.

 

I would skip the bottling bucket, and use this method:

http://www.homebrewtalk.com/f35/we-no-need-no-stinking-beer-gun-24678/

Much cheaper than a beer gun.

And yes, it would be preferable to use CO2 to purge the air from the keg and seal the lid.