There are so many variables acting at the same time here it is hard to grasp, and even harder to point a finger and say this is the problem. There is no question that if you can increase the buffer or bolt weight and have enough gas to cycle the action to support reliable feeding.... for a given powder burn rate and corresponding gas volume, it will slow down the cyclic rate, reduce recoil, weapon bounce, and spring twang and generally just smooth the entire cycle. The same amount of gas is there . It still has to unlock the bolt, and then all the variables kick in. The gas has to move the bolt into the buffer which now weighs more, but the mass that has to be overcome is increased so the bolt is moving at a slower rate. But this changes the gas pressure on the entire process because volume expansion rate is slowed. In other words the gas pressure is working longer. The buffer spring is returning more mass (slower). So Jack to answer your question maybe, maybe not. Is the spring compression too stiff? If so then maybe the increase in mass and a longer dwell reaction time will allow proper cycling aganist the spring. That is why the system needs to be matched. Thats why it takes a lot of knowledge or a lot of experimenting with buffers and springs or gas pressures and bleed off rates to get an exceptionally smooth running AR. Most components will run the rifle unless you get carbine and rifle parts ect mixed on the buffers and springs. I feel for a factory rifle, fed commercial ammo not to run is inexcusable. But it happens! Tolerence stacking, improper breakin, or lube can all cause problems. I would experiment with a CWS as mentioned above as one of the best ways to smooth an action out. Sorry this is wordy but it ain't as simple as it seems. Chief
