I am building my first 6.8 as we speak. The buffer system is the last part I need. I have a Daniel defense 16 inch barrel, larue upper receiver, larue lower, larue trigger, larue lower receiver extender, magpul stock, aero precision bcg, Troy magazine release, bad ass pro safety lever, and curious what buffer system I should get. Should I get the vltor a5 or jp enterprises silent captured spring builder kit? Can I use the vltor a5 in my larue lower receiver extender and if the jp enterprises should it be heavy h2 or standard? Thanks for all of the help.