Remington 700 Firing pin drag

[rwj]

Id keep that .275 of pin fall. On a Rem you wont eliminate cock on close without a lot of work. You will still have coc even at .240. I actually prefer it to pick up sooner than later if your stuck with coc. Its less clunky. If swapping out your firing pin assembly fixed the drag you have a pretty good clue where to look already.

Why do some prefer to have no firing pin spring compression when closing the bolt? It would seem that the firing pin spring compression force, via the torque applied to the bolt, will disturb the rifle equally whether during bolt opening and/or closing.

 

[WSnyder]

Why do some prefer to have no firing pin spring compression when closing the bolt? It would seem that the firing pin spring compression force, via the torque applied to the bolt, will disturb the rifle equally whether during bolt opening and/or closing.

What do you mean by “no firing pin spring compression”? Do you mean no further spring compression (no cock on close) than it already has when closing the bolt? The spring is compressed as much as it can be when the cocking piece is sitting in the notch at the top of the cocking cam on the bolt.

 

[BoydAllen]

What do you mean by “no firing pin spring compression”? Do you mean no further spring compression (no cock on close) than it already has when closing the bolt? The spring is compressed as much as it can be when the cocking piece is sitting in the notch at the top of the cocking cam on the bolt.

As you close the bolt, coming down from the top position, if the cocking piece engages the trigger while the leading edges of the lugs are still on the closing cams, the bolt will be pulled forward, further compressing the spring, and increasing the firing pin fall. That is the mechanism of cock on close. Functionally, since these were designed as hunting actions, disturbance of the rifle in bags was not a big issue, but the cocking that takes place during closing reduces the effort that would be required to do it all on opening.

 

[WSnyder]

It is easier opening the bolt with the thumb on the tang than closing it without that additional support when closing. That is where the advantage lies when setting up an action for no clock on close on a comp gun. You can line up the gun and are able to more easily close the bolt without disturbing it further when you have no cock on close.

 

[Edd]

Never heard of this. How do I measure this dimension? Do I measure cocking piece protrusion before and after bolt handle closing?

You have the barrel removed so you can measure it from the front.

With a fully assembled bolt and the trigger installed lower the bolt handle until the bolt lugs contact the ramps on the receiver lugs. Measure from the front of the receiver to the front of the bolt. Now finish closing the bolt and take another measurement. The difference in the two measurements is the cock on close amount.