How can a BCG change recoil impulse?

[me2hootyhoo]

I have one particular bcg that causes a noticeably sharp increase in felt recoil in my rifles. I do not want to name the manufacturer, I just want to understand why. I have compared different bcg’s and the only obvious difference I can see is they all seem to have a slightly different cam path. It is nickel boron from a respected manufacturer. Manufacturer does not have an answer.

[MorphCross]

Is the difference in your perception of the recoil uniform when using this BCG on all of your rifles?

Have you tried a different bolt in the carrier?

I would be curious as well what certain SME/Industry Pro's make of your situation...

[me2hootyhoo]

Is the difference in your perception of the recoil uniform when using this BCG on all of your rifles?

Have you tried a different bolt in the carrier?

I would be curious as well what certain SME/Industry Pro's make of your situation...

Yes, guns that run smooth, run like a jack hammer with this particular bcg.

I have not swapped the bolt only, just the complete bcg.

Manufacturer claims headspace issues can not cause this.

[Mjolnir]

I have one particular bcg that causes a noticeably sharp increase in felt recoil in my rifles. I do not want to name the manufacturer, I just want to understand why. I have compared different bcg’s and the only obvious difference I can see is they all seem to have a slightly different cam path. It is nickel boron from a respected manufacturer. Manufacturer does not have an answer.

That “slightly different cam path” makes a much more than slight difference.

The “more aggressive” the path the more “perceived violent” the bolt will lock & unlock. And it IS/WILL BE more violent.



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[me2hootyhoo]

That “slightly different cam path” makes a much more than slight difference.

The “more aggressive” the path the more “perceived violent” the bolt will lock & unlock. And it IS/WILL BE more violent.



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The interesting thing I noticed, was when comparing 4 different bcg’s, all appear to have slightly different cam paths. What I did was pull the bolt out until it starts to turn. At that point, without using anything to measure, I could see all four were at different lengths extended from the carrier.

Now when you say more aggressive, does that mean the cam pin turns almost immediately or one that can go strait longer the turn more abruptly? I have a good amount of bcg’s floating around and it’s interesting to see and feel the differences when comparing them.

[Gunfixr]

Interesting

[hotrodder636]

I don’t know that I would have equated difference in cam path to change in felt recoil. Interested to find put the learnings on this one.

[Stickman]

At that point, without using anything to measure, I could see all four were at different lengths extended from the carrier.

I’m going to assume, and I know what that gets me, that the worst recoil is with the farthest extended? The other option would be least extended, but I think that would be creating other issues.

[Mjolnir]

The interesting thing I noticed, was when comparing 4 different bcg’s, all appear to have slightly different cam paths. What I did was pull the bolt out until it starts to turn. At that point, without using anything to measure, I could see all four were at different lengths extended from the carrier.

Now when you say more aggressive, does that mean the cam pin turns almost immediately or one that can go strait longer the turn more abruptly? I have a good amount of bcg’s floating around and it’s interesting to see and feel the differences when comparing them.

The one that has the more aggressively (makes the complete turn in the shortest linear path) would be the most violent.


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[me2hootyhoo]

I’m going to assume, and I know what that gets me, that the worst recoil is with the farthest extended? The other option would be least extended, but I think that would be creating other issues.

Yes, I believe you are correct, it is the one that extends the most. It is noticeable, the rest are fairly close.