Ring them and ask them to check is the answer....
Some crane stocks are tighter than others & G&G ones can be a bit of a pinch
The crane tubes are not much over 18mm - maybe 19mm at a push
ye olde nimah's are about 17mm diameter with a wire running down the side
20mm imho is going to be pushing it in a G&G crane stock
even if it fits now and it will be a bloody squeeze, there is the issue of removal
and if like most lipo's they can puff even just slightly over time - then it will get bloody tricky
Now there might be ever so slight revisions over the last few years
but from my recollection the std G&G crane stocks were not renown for very generous battery space
(I don't use them myself on most G&G's)
pretty sure the length is about 114 to 127 (5 inch max) & ABOUT 18mm or just over (19mm)
battery dimensions on your list flags up 2cm/20mm so to me caution is starting rise in my mind !!!!
I could be wrong, but think it is going to be tight or too tight that it won't fit
Anybody with a mp5k will know how damn tight sometimes these batteries just won't fit unless you hammer them
(not wise btw - bloody cheapo Galaxy MP5K is a bitch even with nimah battery supplied with gun)
I'd ring them and ask for confirmation if it fits the Raider's they sell if I was you
