Because mags are modular, valves can be swapped into any body, for example means that they are literally the sum of their parts. Unless you had a Eclipse
Basically you figure out the value of the individual parts and that gives a ballpark figure of the markers value. Most mags are worth at least 100 unless
Thanks for the appraisal! any explanation on why the retro is so valuable? it seems like a rough little market with only collectability going for it.