The MGI RRB(Rate/Recoil Reducing Buffer is one of the heavier ones out there, just over 7 ounces(as mentioned above).

It differs in design from the others. The MGI RRB has a very short thick plunger end on the back end of the buffer, and a set of tungsten sliding weights inside.

When the buffer approaches the rearmost part of its travel near the back end of the buffer tube, the plunger contacts first, thus propelling the sliding tungsten weights forward inside the buffer itself.

These forward-moving weights then "hit" the front end of the rearward moving buffer body, thus cancelling a major amount of the rearward moving mass-related recoil impulse that affects the shooter, and it also reduces the muzzle rise. The heavy weight of the buffer also reduces the rate of fire.

This system was developed years ago during the development of the famous Counterpoise System which was designed by Mack Gwinn(MGI) and Jim Sullivan(co-designer of the AR15).

This is a highly reliable buffer which has seen use in military, law enforcement, competition, and recreational shooting, for a number of years now.

It is as close to a "universal buffer" as anyone has ever seen, being commonly purchased(and well received) for calibers such as 50 Beowulf, 458 Socom, 223/5.56(all bullet weights), 7.62x39, 5.45x39, 6PPC, 6.8RemSPC, 9mm, 45ACP, and it even works very well with 308 in an AR10. All with the same buffer!

You can expect a reduction of ROF in full auto of about 20%, compared to previous ROF in that gun. Full mag dumps are possible without losing the target in the sight picture. Short bursts are as accurate as semi-auto fire.

For semi-auto use, follow up shots are much quicker, recoil is reduced, and muzzle rise is reduced. Reliability is increased, especially in carbines and shorties.

Rifle and carbine versions available.