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Here's the J-Lock next to the Callahan replacement.
It is often said that the "kinked" spring slows lock time because of "friction" against the bolt body.
This is not true (that's about as polite as I can get about it).
Just because one of the springs "looks straight", it does NOT mean that it is friction free.
Remember that a long thin spring under compression MUST bend (kink) because it cannot support itself.
So the straight looking spring is rubbing against the firing pin itself, and the other is rubbing against the bolt body - Big Deal!!
ALL firing pin springs rub against something, because they cannot support themselves!
The amount is resistance is maybe an ounce, and the spring is between 24 to 30 pounds - so there is no significant resistance.
But the other side of the coin is that (as you can see) the firing pin o the J-Lock unit is much thinner, and the stop ring on the pin (the ring that is in the front of the spring) is also thinner.
The actual reality is that the firing pin on the J-Lock weighs about 450 grains, and the "standard" pin weighs about 750 grains (I weighed them both)... so the lock time with the pin with the kinky spring is ~1/2 the lock time of the straight spring.
It is not slower, it is EXTREMELY fast.
Unfortunately, this rumor has been so wide spread that Remington abandoned this design pin for cosmetic reasons, for a much heavier one, so the spring would "look nice" to the public.
People see something, and they "think" they know that there is a problem, and then they make up theories justify their opinion.
In this case, this rumor has hurt the shooters of Remington rifles.
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