SKS Bolt Modification Explained.

[True North Arms Corp]

When we released the SKS Magwell Adapter (watch Part 1 HERE), one question kept coming up: what about the bolt modification? Many shooters weren’t sure how the tilting bolt interacts with detachable mags—or why that little cut at the back of the bolt makes such a difference.
Here’s the breakdown: the original SKS bolt has a lip designed for the old duckbill magazines. That lip prevents you from swapping mags on a closed bolt. By milling down that lip and cutting a small slot, you give the bolt room to tilt properly while still feeding smoothly. The result? You can now insert detachable mags without fighting the bolt, no hacks to your magazines required.

This small modification transforms the SKS from a surplus relic into a more modern, user-friendly rifle—especially if you’re running our Magwell Adapter. Done right, it’s clean, reliable, and keeps your rifle running just the way it should.

You can watch our new Youtube video that explains it all for you:

- Link to purchase Magwell Adapters -
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Also,
Do you have any videos or photos of your TNA guns or parts that you'd like to have featured in our social media?
Email them to 'hello@truenortharms.com' and we'll tag you (if you want).
We'd love to see these toys in use and being a part of your everyday life.

As always thank you for your support!
-Stanley and the gang

 

[LumberJack13]

Does the BLEM AR-15 Chassis for SKS take the mag adapters?

 

[seaslug]

Does the BLEM AR-15 Chassis for SKS take the mag adapters?

I've got the same matador arms chassis and yes I had a gun smith do the work to make the adapter work.

It works great in my rifle but hical will tell you it won't work.

That's smoking deal for the chassis I paid 600 for mine last year and it didn't come with any of the extra parts.

 

[Ungrateful]

I just saw this original post but the reason you can’t change mags on a closed bolt is actually the relief cuts on the sides of the bolt are there for the feed lips on the original magazine. They prevent the magazine from dropping while they are engaged. I converted an Sks to feed from ak mags years ago and the ultimate solution was to mill the sides of the bolt down to the same depth as those grooves all the way to the bottom. It made no difference for using the original magazine either.