Terrible inefficiancy with retro valve. is it supposed to be this bad?

[trains are bad]

open it an inspect the orings every couple times of play.

Bad idea. If it's not broken leave it alone. Word.

[RoadDawg]

Bad idea. If it's not broken leave it alone. Word.

That doesn't do much good if I get to the field and an oring has gone bad. Especially since none of the fields carry mag replacement parts. It's a thing called preventive maintenance. It's just like a car. If you don't catch a problem early it can end up costing you more then what it should.

[trains are bad]

hmm well I go for months/years without haviing anything internal go wrong with my mag, and if it ever does it takes ten seconds to flop new parts in it at the field.