I'm doing my first 6.8 build and have read a lot of advice on the weight but most of the builds are way beyond mine. I'm using Aero XL upper with a Aero lower. Planning on a Wilson Combat 16" barrel. I will not be running a can of any kind. I run a Geissele super 42 just wondering if I could use the same spring with an H2? I use the H1 in a 20" 556 and its awesome.