Hey guys. Doing some assembly for a colleagues customer on a .308 build. Not a big fan or have a huge amount of experience so here the question...

I’ve always seen .308 buffer tubes be “SR-25” or A5 length with a longer buffer and rifle or Sprinco green spring. This one (Aero upper and lower set) has a 6 pos std carbine length tube with a dinky short buffer and odd proprietary spring. To me, with limited .308 experience, it looks like it does have enough space for that big bcg to move properly in.

Could this be viable or does it need the longer tube?

Thanks in advance.