www.MG42.us

Hello all,

I've run into a problem with my MG42/59. The Booster cone cracked, and while it was in storage someone cleaned the room and thought it was junk and threw it away. I've desperately been trying to find a replacement part for it, but with no luck.
Does anyone have the measurements for one so that I can have one manufactured?
I found this thread about it : viewtopic.php?f=9&t=13174&sid=4dfadad19 ... 3&start=20

But it's a very rough sketch, and he didn't specify what measurements he changed exactly for his last attempt that seemed to work.

Booster cone. Also known as the nozzle that goes inside the flash suppressor.

Throwing the broken one away was a mistake. Nozzles are made with different size holes and you need the correct size to make the gun function properly. Different size front holes is how the recoil is adjusted to make the bolt go fully rearward to eject the fired shell. You may end up needing to buy a couple different sizes to get the gun to run right.

Nozzles are for sale here, second row up from the bottom of the page.

https://mg34.com/product-category/mg-42?page=2

That topic looks like a fully dimensioned drawing to me, you could take that to anybody who's run a lathe for a few months and likely get a part that would work. Not sure what sharpening up the inner radius would do, but there's only one radius on that drawing so that narrows that one down. Those kinds of dimensions should be pretty easy to confirm with the parts you have, the rest you might just have to go with trial and error. Just remember to make the nozzle opening big enough and start at the 10.5 or 11mm as stated by John Baum in that thread.