The AR10 has the faster bolt speed......

[cal50]

Cool high speed comparison between 7.62 rifles AR10 Armalite, HK MR762/HK417 & SIG 716


Some bolt bounce, oscillation and a belch of gas......

 

[Morale_Gear]

It's pretty cool to see them side by side like that!

 

[Ballista One]

Some bolt bounce, oscillation and a belch of gas......

You meant to say carrier bounce right?

 

[MMAJunkie]

Is that a function of spring pressure?

 

[LRRPF52]

Gassing, operating system weight (BCG + Buffer weight), lubrication, and spring weight factor into the rearward stroke.

Buffer bumper, buffer weight, spring weight, BCG weight, lube, cartridge presentation, and feeding factor into the forward stroke speed.