I like the Enidine, it reduces the cyclic rate significantly (when compared to the carbine, H, H2, and H3 buffers), while concurrently affecting a very noticeable decrease in muzzle rise. The progressively heavier H2 and H3 buffers do reduce the cyclic rate some, but their added weight makes the rifle feel "bouncy", whereas this condition is not present when using the Enidine buffer. The recoil reduction of the Enidine is even noticeable on semi-auto, as it removes the slight "thump" you normally get when the bolt carrier and buffer bottom out at the end of the recoil cycle. You can really notice this in "before and after" testing of the rifle. Basically, the Enidine works like a shock-absorber, preventing the bolt carrier from "bottoming out" harshly every time you fire a shot. The Enidine also has a total weight of 4.3 oz., which is about the same weight as an H2 buffer (4.7 oz.).
The MGI Rate Reducing Buffer has a total weight of 7.1 oz., which is significantly heavier than even the standard rifle buffer (5.15 oz.). The MGI's weight is similar to some of the heavier 9mm buffers, which have been known to break bolt catches. I have found NO reports of bolt catch breakages when using the MGI RRB, so I will assume this is not an issue. I have heard a few reports of the MGI's roll pin migrating (coming out), which could gouge up the inside of the buffer tube if not discovered in time. I don't think the roll pin could come out far enough to allow the MGI buffer to actually fall apart, as the buffer tube would be the limit stop to this movement. I wonder why MGI doesn't just use a pressed-in solid pin, or at least a coiled style roll pin in their buffer. It's not like it needs to be disassembled on a regular basis, which would be a sound reason for using a roll pin.
I personally would rather use the lighter buffer which works as well (the Enidine), if for no other reason than to reduce the amount of weight being being stopped by the bolt catch. Keep in mind that the bolt catch is attached to the expensive lower receiver, and the impact from the cycling mass hitting the bolt catch is transferred directly to the lower receiver. There is obviously a threshold for damage in this regard, but I'd prefer to be as far away from that point as possible.
As Tony would write: "YMMV
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