shot for shot performance
 

just recently saw the advantages of a concave spacer.i might give that a go.would i notice the improvement even with a stock inner that already is nicely accurate and using good bb,s or do the ultimate and pair that spacer with a tight bore?

Say again?

the post that i saw on concave spcers at the hopup unit.theyre curve over and not H shaped.

Yes... but what is the question?...

I believe he's asking if a tightbore would increase his accuracy, with conjuntion with the SCS. Or to just stay with the spacer and not install a tightbore.

Correct me if I am wrong.

The SCS is the cheapest upgrade to improve shot to shot consistency in your gun and the best. It doesn't require modification to standard AEG hopup units, and you can use it with any other upgrade like tightbores.

With each upgrade you will get incremental improvement to your shot to shot consistency. The most important parts for accuracy and consistency IMO is everything in front of the gearbox, hopup unit, barrel, rubber, spacer, and the fitement of all these parts to each other, AND how they fit with the externals.