Relationship between buffer weight and spring weight??

[Clint]

The gas system imparts more or less constant impulse / momentum to the moving mass.

Heavier buffers reduce recoil and counter recoil velocities, along with recoil energy. E = 1/2 m v^2

Heavier springs can absorb and release more recoil energy.

This is all complicated by the fact that excess recoil energy is stored and mostly returned by the buffer tip, resulting in more counter recoil energy and bolt bounce upon return to battery.

************

As mentioned earlier, adding excess buffer and spring do not correct over gassing. They only attempt to mask it.

The most direct way to fix actual over gassing is to reduce the gas port.

[lysander]

The gas system imparts more or less constant impulse / momentum to the moving mass.

Heavier buffers reduce recoil and counter recoil velocities, along with recoil energy. E = 1/2 m v^2

Heavier springs can absorb and release more recoil energy.

This is all complicated by the fact that excess recoil energy is stored and mostly returned by the buffer tip, resulting in more counter recoil energy and bolt bounce upon return to battery.

************

As mentioned earlier, adding excess buffer and spring do not correct over gassing. They only attempt to mask it.

The most direct way to fix actual over gassing is to reduce the gas port.

To further expound:

Force = mass x acceleration

if the force from the gas system is more or less a constant, 800 to 1000, pounds, and a stiffer spring does not reduce this, the only way to reduce the acceleration is more mass.

Higher acceleration = higher velocity = higher energy.

All that energy is stored in a spring and therefore returned when the bolt starts to move forward.

There are only two ways to reduce the energy in the system: 1) increase the mass (heavier parts), or 2) reduce the force (smaller gas port).

[RVTMaverick]

BEST Fix... as some others have already said here.... Smaller Gas Port
Here, I'll hook You up with the "Shortcut" >>http://www.blackrivertactical.com/concrete5/contact/

[Dr. Bullseye]

I was researching buffers once and found this video.

Buffer Theory 35 minutes
https://www.full30.com/watch/MDEyODM...se-what-buffer

[vicious_cb]

I was researching buffers once and found this video.

Buffer Theory 35 minutes
https://www.full30.com/watch/MDEyODM...se-what-buffer

Remember when I said this dumbass video is going to mislead people into picking buffer weights based on barrel profile. Voila here you are folks.

https://www.m4carbine.net/showthread...fer-quot/page6

[AndyLate]

I can select parts and assemble satisfactory ARs and still don't understand what the "perfect" relationship between buffer weight and spring strength should be.

If I was trying to tune 9 different ARs, I would be reaching out to the barrel or URG manufacturer for recommendations.

Andy

[Clint]

Just wanted to clarify this point.

The gas system imparts more or less constant impulse / momentum to the moving mass.

The magnitude of this impulse is directly related to the gas port area, gas system configuration and of course, the cartridge pressure curve.

[Dr. Bullseye]

Remember when I said this dumbass video is going to mislead people into picking buffer weights based on barrel profile. Voila here you are folks.

https://www.m4carbine.net/showthread...fer-quot/page6

Don't you think you are miss-characterizing this video quite a bit? He discusses many variables, which is my point, and mentions barrels at the 18 minute mark or so and then in the context of full auto and says in semi auto you should stick to the buffer which came with your rifle in most cases.