Marushin MP40 Casting blow holes!

Hi Everyone, this is my first Post - but I am pleased to be here and am extremely grateful for the wealth of knowledge all the members have placed in this forum.
Hope my contribution(s) will help someone some time! ('')

I recently bought a second-hand MP40 for NZ$270, and knew from the buyer there were a couple of problems.
When I got the gun, I removed the barrel - and thanks to this forum and its contributors I was able to remove the faulty parts. It needed a new chamber and barrel!

Checking with Francky and his web site I decided to get a new HW bolt as well as HW barrel & chamber.

Problems started when the new barrel wouldn't fit into the end of the trunnion.('')
Inspection showed a "blow hole" in the casting.

This lump had prevented the barrel seating correctly.
The previous owner had shaved the barrel end to make it fit, and had removed a bit too much plastic!('')

I decided to sand down as much as I could of the inside of the bulge in the trunnion, and slightly sand the barrel end only if needed.


The old barrel housed the steel bar that the detonator bar sits on, and I had to remove it by cutting the barrel and "panel-beating" the bar back into shape. It had been "munted"! When installing into the new barrel it became obvious that the original owner had assembled it incorrectly and hadn't inserted the bar deep enough into the old barrel. THATS" why he'd done so much shaving and chopping !!! To make everything fit a 3mm misalignment.('')

A bit of gentle sanding, a deep bar insertion - and my MP40 was back to normal.('')

I bought a repro sling (thanks for the source Cerwyn) and consulted with Francky (VERY helpfull - thanks) and my MP40 - which came with Bakelite repro furniture - is my pride and joy!
PS Having the freedom to do so in New Zealand I have a lifetime collection of real guns, blank firers and Gas Blowback & SEG guns.

The MP40 is my first Modelgun. My second is a Marushin PPK/S I got from Francky as a kitset! I kinda feel I've got bitten by the Modelgun bug and my Bank balance with be diminishing on a regular basis!!!!
I'm looking at a MGC Thompson and a Marushin Walther P38 now ..........and .........??????('')

Hello, good to see you there :-)

I'm glad you decided to share the story of fixing your MP40, that's how this small community lives :-) It is always interesting to read about models, especially if you already provided solution in the story :-)

This hobby will get you in no time... I "just" wanted to see what a modelgun is, and suddenly there is more of them than I have fingers! In a way it is a motive to work better and earn more money for modelguns ;-D

How do you choose models to get? I see that the ones you listed are WWII, is it the key?

Hi Kiwi , and thanks very much for your first post.

Discussing problems like these are a great help to all of us. Many have been experienced by other members in the past so answers and sollutions can be quick in coming.
A written account of unusual problems with a description of your own sollutions will no doubt help someone else at some point.

I'm glad to see that the contact we had leading up to your first post got your MP40 sorted at last

Try this link for photo posting help:
https://mp40modelguns.forumotion.net/modelgun-general-discussion-f1/posting-pictures-t737.htm?highlight=posting+photos
I use Photobucket myself and can recommend it as dead easy to use. The only things to remember are keep the photo you use on a forum live in your "album" otherwise it'll vanish from the forum and log on to Photobucket at least once every 6 months. If you don't they'll shut the account and all your photos will be lost

A write up on your experience building the PPK Kit would be of great interest too please, if you find some time on your hands

Thanks Cerwyn & Smootik. Appreciate the comments and advice - will make a PPK/s post later this week, if I can tear myself away from playing with my new Modelguns!
Cheers.

Managed to figure out a way to download images - with Cerwyn's help! (Thanks)

Hope these picture help make more sense of the post!
Cheers.