StrangerDanger Posted July 5, 2009 Share Posted July 5, 2009 After 10,000 rounds through my M4, I feel I can say that the weakest link I've found in the platform is the trigger disconnect. When you fire a round in the M4, and the BCG cycles to the rear, the disconnector is working properly. You could pull the trigger at this point and the hammer will not fall. However, as the BCG begins to move forward and the shell elevator drops, the disconnector is now disengaged. During this time while the BCG is still moving forward into battery, you can pull the trigger and the hammer will fall. What you end up with is a chambered round and the hammer down against the rear of the BCG. to clear this, you must manually chamber a fresh round to recock the hammer. The live round that was chambered is then ejected. I've installed a lighter bolt handle that weighs 8 grams opposed to the 12 gram factory handle. This has sped up the action slightly. You must have a solid stance with the M4, or you can hear that the weapon is cycling slower than usual. Running the weapon wet with oil helps also. Some would say, just slow down. However, if I have my followup shot in sight, I'd like to take it without inducing this type of failure. The recoil reduction of the M4 is so great that shooting follow up shots like performing double taps with a pistol is easy. As fast as you can pull the trigger, you can keep the weapon on target. Even with high brass loads. You can cause this failure by hand (without a live round) by cycling the weapon. As soon as the elevator drops, there is about 2 inches of BCG travel that the disconnector is disconnected. I contacted Benelli about this years ago. I thought there was something wrong with it. They basically gave me the line, "It is what it is." It was inspected by Benelli when I had the 4 port barrel replaced and they said it was fine too. An aftermarket fix would be awesome. I don't know how it would be done though. The disconnector would have to be based on BCG placement rather than on the shell elevator. Anyone else experience this? Quote Link to comment Share on other sites More sharing options...
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