The 10.5" carbines have a very short dwell, and they have relatively large gas ports to get a quick burst of gas to operate the system, instead of getting a longer gas charge from normal dwell.
As a result, this can get things into motion more quickly and perhaps violently, and that's why the heavier buffers are preferred in these 10.5" applications.
The heavier buffers will tend to help delay your extraction slightly and to make the cycling slower. This is good.
However, the actual energy imparted to the system from the gas is the same, and even if the heavier buffer takes a little longer to get going, and goes slower, the energy being transmitted rearward is roughly the same as with a lighter buffer, except slower.
Sort of like light and fast, vs heavy and slow. Different ways to transfer the same energy.
When it hits the back end of the buffer tube(and consequently your shoulder) it will transmit that same amount of energy(roughly) as the lighter buffer would have. Slightly less sharp perhaps, but more inertia and more "shove" to it. Just as it didn't really want to get into motion right away, it doesn't really want to stop right away either.
So, if you want to help with the recoil reduction and muzzle-rise, then you're going to need a buffer with a recoil-reduction function built into it.
The MGI RRB (RateReducing/RecoilReducing Buffer) is made for these types of applications, and consists of a heavy(7.1 oz.) buffer with a mechanical tungsten weight and spring system which is activated at the back end of the recoil stroke by a very short plunger in the buffer tail. This sends the tungsten weights into forward motion inside the buffer body, to strike the rearward moving parts just prior to bottoming out at the back of the buffer tube, and cancels a large portion of the recoil, and spreads-out the impulse of whatever recoil might be left.
And it has the delayed extraction and slower cycling benefits of the 9mm type buffers too.
And the tungsten weight system also performs to eliminate any bolt bounce.
It will provide better cycling characteristics, less recoil, less muzzle rise, and overall better controllability of the weapon, especially during rapid fire sequences. Works equally well in semi-auto or full-auto.


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