Excuse the noob question, but never having built an AR platform before, I've gone down the rabbit hole of online (mis)information regarding proper components... Especially surrounding the UBR gen 2. I'll be ordering the stag-10 receiver set shortly, but I've acquired the following parts so far;
20" Faxon .308 big gunner barrel
Faxon BCG
UBR gen 2
Maple ridge armory .308 H2 carbine buffer 5.0 oz
Strike industries Ar-10 flatwire carbine buffer spring
With this set up, would the included spacer be required in the UBR buffer tube? For the folks running similar set ups, (carbine H2 buffer and spring, rifle length gas) would you recommend a fixed or adjustable gas block? I'm leaning towards fixed for simplicity as long as it's not overgassed... I've been reading on some of the US forums about guys using buffers at 8+ oz with similar builds