Yeah, the .177 Marauder is supposed to be super quiet. It has a full length shroud.
I'd take the sights off to start out with so I could mount a scope lower. The iguanas are up in trees and not super easy to see, so I guess a scope that gathers a bit of light.
I've seen some really good deals on crossbow scopes (35 yard parallax and drop compensating reticle that might match an airgun) at Natchez, so I might try one of those.
Most people who are hardcore airgunners would probably recommend a AO or side focus scope.
