See the link below. There are 2 versions. Here is one of them.
Crosman has most all their diagrams for the airguns that they make online. See http:/www.crosman.com/airguns/service/manuals/crosman-rifles Locate your model towards the bottom of the list. You will also find the owners manual listed.
To see how the Crosman 788 is assembled go to the link below and open it.
Without more information about the condition of the rifle it is not possible to give you an estimate of value.
14% of 788 = 14% * 788 = 0.14 * 788 = 110.32
it was made between 1978-90. The highest value is $45 ( Bluebook of airguns)
The factors of 788 are: 1, 2, 4, 197, 394, 788.
6641
3.94
0.0051
The Crosman model 788 BB Scout was made between 1978-90 depending on the variation. You need to state the current working condition of the rifle to get an estimate of value.
.89 is greater than .788
0.788 = 788/1000 = 197/250