this post was submitted on 26 Oct 2025
3 points (100.0% liked)

Help & Support

184 readers
26 users here now

Post here if you have general questions concerning GunCAD, printing, or otherwise fabricating DIY firearms. Newbies are welcome, but users are encouraged to read Ctrl+PEW's Getting Started Guide if they haven't already.

Shitty stock image may be changed at moderator discretion.

founded 2 months ago
MODERATORS
 

Hey All,

Went to the range the other day to finally test my DB Alloy build. Before I ever got to the shooting phase, I had issues with the printed Sten mags, so I decided to buy a few surplus mags from Atlantic Firearms. So I got my mags, polished them up, put a little lube around the follower and what not. The mags work fine outside the gun itself.

Got to the range, loaded up my mags, and when I pulled the charging handle, it seems like it is double feeding. The bolt charges two bullets instead of the one. Whatever, tried another mag, same thing. I'm thinking this is on the mags.

Any suggestions?

you are viewing a single comment's thread
view the rest of the comments
[–] pepesilvia 1 points 1 month ago

I had this same issue and haven’t figured it out. I’m thinking of maybe modifying the tab to have the mags sit a hair deeper into the lower. What upper are you using? I’m using the left side charging Masterpiece arms upper.