Re: New 6.5 build
Make sure you want a 20" barrel, I have a 18". If you go with 16, get a mid-length system. I like the std, simple gas block. Also, I use a BCM m16 carrier, more mass and a H2 buffer.
I do think that stock will make a 20" nose heavy. Also, I would not use a scope over 10x. Accually, a max 7 - 8 power would be ideal for a lt weight rifle.
I like the Grendel, with the new 123 SST, it may be the do all bullet for the 6.5G.