What is the J Lock on Rem Bolts?

[jasonprox700]

I recently aquired a 7mm RUM that has the J Lock bolt. What exactly does this do? Will I gain anything by swapping it out? This gun will be used for a .300 RUM project, so any suggestions would be appreciated.

 

[geargrinder]

I recently aquired a 7mm RUM that has the J Lock bolt. What exactly does this do? Will I gain anything by swapping it out? This gun will be used for a .300 RUM project, so any suggestions would be appreciated.

It's a lock that physically locks the firing pin. It's just another thing to go wrong at the worst moment.

For about $50 you can replace it with an aftermarket assembly from Callahan, PTG, or others.

IMO, you'll get better and more consistent primer strikes and shorter lock time if you replace the J-lock.

 

[Moman]

Here is the one I got to replace my J-Lock. I was amazed at what a twisted mess the spring was on the J-Lock.


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