I am in the process of putting the tacamo mkv kit together and am wondering what kind of barrel fits on the MKV kit for 98 custom. For example do I buy a barrel with auto cocker threads or some other type threading? Also, I'm about to order the MKV DMAG magwell and noticed that the Mkp magwell can be purchased together with either the 14 or 20rd DMAG pack. Can a combo option be made to purchase the MKV DMAG magwell with 10 14rd dmags and 10 20rd dmags as well? The Mkp DMAG magwell and DMAG magazine combo runs a little cheaper than buying everything seperate and hope the same incentive combo can be extended to MKV and mk5 when it's out. Thank you very much for the help.