How is this done?

[hardwarz]

I was looking at the YHM link. I'm guessing that since it's gas piston, you can adj the pressure that cycles the bolt.

If you can adj the pressure cycling the bolt, you can reduce it.

If you can reduce the pressure, you can use lighter recoil spings.

Since they are using a folding stock, that would mean that the bolt carrier is abbrivated (shorter) If it were a standard bolt carrier, it wouldn't cycle without the buffer tube.

With a shorter bolt carrier, the lighter buffer spring can go into the upper receiver and close down on to the lower.

Of course I don't know 100%, but this would be my best guess.

Hardwarz

[hardwarz]

Ok, I was close. Bolt is abbrivated, but the spring is up in the charging handle.

This is a picture from the YHM ZM instruction manual on the website.



Hardwarz

[The Knight Of Light]

Originally Posted by hardwarz

Ok, I was close. Bolt is abbrivated, but the spring is up in the charging handle.

This is a picture from the YHM ZM instruction manual on the website.



Hardwarz

The spring is where the gas tube should run, like other piston uppers. It rides on the outside of the carrier key piston. I saw it all on ShootingUSA. The little half moon thingy #29 holds it all in place.