It's called Belzona, some industrial filler, there's iron in it ..
For the finishing touch I use some car filler, the very smooth one.
it's hand shaped, not as easy as it looks actually, these groud dug items sometimes loose a few mm all around ..
Nice MK108 and links! I've got just about 1 of each. About 6 or 7 different ones.
I use Nural21 as a filler. It also has some metal, I believe. I used it for my MK101 Sprgr patrone L'spur. Pitty I didn't have my airbrush when I painted them. I might remake them.
BTW, do you need some magnesium caps for those HK rounds there behind? What are they? 2,8cm or 3,7cm?
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