Rule of thumb is ...... " its worth what you can sell it for "
Its a little difficult to put a value on it with the extras like mags etc as many people would only want the MGC MP40 and the mags/pouches /helmet wont be of any value ( to them )
Lets work of the basic gun
questions that affect value
1) is the bolt face cut off at 45%
2) is it one with the enclosed recoil assembly
3) has the front end lower part of the receiver been cut/drilled
4) do you intend to sell it in your home country ( I believe there are restrictions in place regarding the changing of ownership) or overseas ?
5) some photos will help
bottom value Id say is £200 to £300 for any MGC MP40 but you can double this depending on the answers above
( I once got one only a couple of years ago for £80
)
DOC
Oh and hi and welcome to the forum ...where are my manners