Tippmann 68 special (SMG60 converted), help with Barrel ID and valuation

[Wanderingronin]

Hey all, I bought a lot recently with some oddities. Once is this 68 special, which looks like it was once a SMG 60. It came with several barrels, one with a raincover (homemade maybe?) and one clearly aftermarket barrel. I replaced a couple orings and the marker works as it should and is in pretty decent shape for its age, but I have NO IDEA what to ask for this. Any help would be appreciated, thanks!

[Jordan]

$50 if you're lucky.

[Carp]

If it was still an SMG-60.....$200-400.