What is the J Lock on Rem Bolts?

jasonprox700

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Joined
Jan 17, 2007
Messages
264
Location
Black River Falls, WI
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

Well-Known Member
Joined
Nov 6, 2006
Messages
2,007
Location
Dayton, Nevada
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.
 

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