Yes they do. I just had my LP5 converted to air.
Iirc, costed me about 250 euro's.
Does have more shots per fill in co2 though, and I feel, different recoil.
But thats the semi auto LP5.
Its not really worth the $$ imo, if yrs is shooting well, and you dont shoot matches (outdated cilinders).
I converted mine, cause an overhaul, incl new cilinder date etc, was nearly as expensive