doing a few builds and i plan on using toolcraft bolts. i see there are single and dual ejectors for the bolt. does it really matter? i plan on buying a few for spares.

builds will be 308 SBR around 13.5ish with a saker and an 18" or 20" with a tbac ultra9
the longer barrel will probably be rock creek, the short will probably be BA
slr adjustable gas blocks
aero m5 reciever sets
still undecided on hand guards