Any possibility that the barrel locking nut gets loose and

I will preface this by saying the Murphy lurks everywhere waiting to create trouble. But the short answer to your questions are no and no. Enjoy shooting and don't worry.

Those suckers are on tight!!!!!!!

Think about how the gun is constructed. The barrel threads into the receiver, and the locknut threads onto the barrel. As the barrel and locknut screw in the same direction, the headspace can not change (i.e. the barrel unscrews a bit) unless the locknut moves. The locknut, as Olbiker said, is on pretty tight. There's no way one is going to come loose through shooting.

This is a similar set up to Savage guns .........I have rebarreled 2 savage actions and to get a barrel loose takes 3 strong men and an act of God so fire away and feel safe

The barrel nut on the marlins are installed at the factory by a 800# gorilla. So, no, they wont shoot loose.

zigzag said:

headspace measurement changes (after so many rounds) ? Or theres a safety pin to keep it from backing off?

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Well I want to know why you are asking? Something happen?

I was just concern . Thanks to all.

donut slayer said:

The barrel nut on the marlins are installed at the factory by a 800# gorilla. So, no, they wont shoot loose.

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Yaaa-haaa-haaaa! That's what we Savage nuts thought about the Savage barrel nuts. Come to find
out, they get installed by a couple of 120(-) pound women!!

Built this for $25 with some scrap steel. Negates 800lb Gorilla's work.

I have been Fooling with Barrel nut Guns sence the 60 .. They Flat Don't Come Loose But ...... I have seen several Of Them that were Cracked I belive From Over Tighting Them at the Factory Rather It is Savage Or Marlin . And You May Have something none Of Us Have seen before . DD