They're decent barrels actually. Very quiet to shoot. I like the longer control bore since it does give you more efficiency according to the testing I did back in the day. It's not a game changer but every bit helps. If it matches your gun, all the better.
ETEK 3LT, with 14" Ti boomstick and cure 3 + bolt F/S
Vanguard creed eyes, membrane, bolt pin, detents, gaskets, schraders, orings and more F/s[/color]
Old school angel poppets/cup seals(LCD and A4/speed), spring detents(not sure which models) F/S