The Geissele G2S has basically the same feel as the SSA for less money.
I know some people like the BAD-ASS selector but I wasn't super impressed relative to the cost. I use conventional (left only) selectors after trying several ambi options.
I would skip the Tubb spring and ST-T2 buffer. Ideally I would go with an VLTOR A5 system, which will work 100% as delivered. If you want a carbine length system (A5 is .75" longer) then I would do a quality GI spring (like Colt) and an H buffer. 6.8 does not necessarily require or benefit from heavier buffers unless the barrel is ported too large.
All the Daniel Defense parts are good, but if you are buying separate parts I would get the barrel and bolt from AR15 Performance (Harrison Barnes), he makes very high quality stuff at very reasonable prices and probably knows as much or more about 6.8 as anyone. Website:
http://www.ar15performance.com/home
If you are buying a completely assembled upper then Daniel Defense would be an excellent choice.
Handguard is personal choice, but unless you are hanging lots of accessories on it I would go with a more streamlined and lower cost option. The ALG EMR is a really nice handguard for not much money. I also like the Fortis Rev 2, which is a bit more, but still less than a RISII. I would go with an MLOK or Keymod type handguard. I personally like MLOK better, but for now this is a Ford/Chevy or VHS/Betamax type issue.
Magpul MBUS Pro are nice sights. I wouldn't touch ARMS with a 10' pole.
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