just googled spike h2 buffer . im not able to get into the web due to restriction internet at work , but it does have cool logo =D
Gotta love how a $30-$40 question turns into a few hundred dollar solution.
More like a $100 solution (if you get the blemished version)
JP springs are good from what I hear, only thing is you might get light strikes on a military surplus round, harder primer, but other than that they're good.