Yes, it's defiantly possible. I made a HK21 type beltboxmag for a G3 conversion using the top half of a relevant mag and a high-cap winder.
The only question is,why would you want to do it? There was never a real-life drummag for the MP38/MP40...
A Proud Member Of 'Team Spleen!' who play mainly at Gunman Airsoft, Tuddenham, Suffolk.
With my sarcastic head on, I'd say why not also fit a laser scope, a grenade launcher and a tac light? Because they're about as relevant to the MP40 as a drum mag. If you're bothered about being outgunned on a regular open day at a site, buy a few more mags. I have skirmished at open days with 6 lo-caps and never felt outgunned.
You've got nothing to ein, zwei, drei, vier
goes against what I think WW2 Airsoft is all about 
Could be COD WAW's fault as I think you could get a higher cap mag on there on multi-player
If I'm barking up the wrong tree C_asciak I apologise
Still dosnt alter the fact that it didn't happen in "real" ww2
I also skirmish on open days with low/mid caps and if I'm running low a tactical withdrawal ie run away allows me to reload
Cad
Impressions:
U.S. 35th Inf Tech Sargeant
British Royal Artillery Gunner
Generic SS Mann
Weapons:
Cyma M1A1
ASG Sten MK2
ASG MP40
TM M1911A1
WE Browning High Power
HFC Mauser C96
Oh come, come. Real or not does it matter? This sort of thing is certainly not for WW2 games advertised on this forum, for sure, but would no doubt garner some attention at open days where new/unusual/gucci kit is what its all about!
i like a lunch box conversion on mine to keep my sarnies safe whilst in the field
Ah, it explains why your MP40 shoots so bad - your hop is probably crapped up with fish paste.
If you did want to go ahead with it, the simplest way would probably be to convert an MP5 drum mag, as it has the right sized stem. Only diffrence is, that the feed tube from an MP5 mag is located towards the front end, where as the feed tube on MP40 mags is located towards the rear:
A Proud Member Of 'Team Spleen!' who play mainly at Gunman Airsoft, Tuddenham, Suffolk.
Fish paste sandwiches?!! Is that period food?
I think this is a good as it got with the MP40 in terms of matching the PPSH for volume of fire, or so the story went.
By the way COD WAW got this one right... I think.
AGM MP40 - AGM STG44 - CYMA Thompson M1A1 - WE P08 4 inch - Marushin M1 Carbine GBB - AGM Sten MkII
I've seen a photo of a prototype Thompson "LSW" - a Thompson with long barrel and a bipod.
Now THAT would get attention...
I've seen a photo of a prototype Thompson "LSW" - a Thompson with long barrel and a bipod.
Now THAT would get attention...
The twin mag MP40 never took off it jammed like buggery .
i still think it would be quite cool
While everyone is entitled to their opinion, you are WRONG!!!!!!!!
MP40 drum mag....please don't make this....
Ah, If he wants to make a drum mag for his MP40, It's his aeg/time/money. As long as It doesn't show up at WW2 skirms. 
I've seen worse 'tacticool' WW2's at open skirms.
well time and money shouldnt be too much of an issue if it was to be a project in a GCSE but like i said im probably not gonna make it anymore
Good, that means I probably won't have to cave your skull in with said drum mag if you were to!
Crime against mp40's!!
ÏŸÏŸ
My armoury;
Tanaka Kar98(1942 woodwork and parts), M1 Garand AEG(1940's woodwork and metalwork), MG34, SVT40, Mosin Nagant M44, MP40, PPSH41, Luger and PPK.
hope ur not planning on doing any sneaky missions bro, cuz ull b rattling like buggery!
if ur gonna go that far u shud also make a extended mag for sh*ts and gigs like the aussies and kiwis did for ther slrs back in the day
why not just use normal hi caps outta curiosity 
Kiwi airsofter, just pew-pewing.
Hmm.
I'm now tempted to cover my spare MP40 in all the RIS rails I've pulled off other guns over the years, and add the twin drum mag i've got lying around to it, purely because i now know how much it would annoy people...
Thinking you to be a twit is not the same as being annoyed.
aka Stigroadie
AFRA
better by design
"Truth is a shining goddess, always veiled, always distant, never wholly approachable, but worthy of all the devotion of which the human spirit is capable. "
Thinking you to be a twit is not the same as being annoyed.
People already think i'm a twit, I'm now aiming for annoyed.
