04-04-2023, 05:50 AM
I understand the effect on carrier velocity, but dwell time is determined more by the port size/location, cam groove cut and the type of powder (pressure/burn rate) being used.
LMT created a longer cut cam groove for their enhanced carbine bolt carrier to increase the un-locking time process so the case would have less residual pressure during extraction. It worked as designed, but was rejected by the military because it would not work in rifle length gas systems.. The military didn't want two different types of bolt carrier groups in the supply system..
If increase in buffer weight was all that was needed to effect dwell time, then LMT would not have bothered with a re-designed cam tract for their enhance bolt carrier group and would have just increased buffer weight..
The increase in buffer weight has always been to reduce carrier velocity/cycle rate and prevent bolt bounce malfunctions on full auto, not effect dwell time..The original Edgewater buffer was replaced by the newer Colt designed buffer with the M-16. The new Colt designed buffer slowed carrier velocity (decrease cycle rate) and fixed the bolt bounce malfunction problem on full auto, but what it didn't do was have much effect on dwell time (even though it was almost 3 times as heavy) as the original Edgewater buffer..
I quote from the Black Rifle book page 202:
In the rifle, the new buffer did and didn't do several things.
First, because of the random position assumed at the end of each shot by loose-fitting internal weights and discs which compromised a large portion of the buffers mass, the effect of the buffers added weight on the rifle's "dwell time" or bolt opening cycle was negligible.
I understand the inertia forces of increased weight, but the actual effect buffer weight has on lock time has been way over emphasized IMO compared to gas regulation/port pressure/port location/ cam tract design. There is a happy medium with all things but I don't think I'm far off on my assessment..
LMT created a longer cut cam groove for their enhanced carbine bolt carrier to increase the un-locking time process so the case would have less residual pressure during extraction. It worked as designed, but was rejected by the military because it would not work in rifle length gas systems.. The military didn't want two different types of bolt carrier groups in the supply system..
If increase in buffer weight was all that was needed to effect dwell time, then LMT would not have bothered with a re-designed cam tract for their enhance bolt carrier group and would have just increased buffer weight..
The increase in buffer weight has always been to reduce carrier velocity/cycle rate and prevent bolt bounce malfunctions on full auto, not effect dwell time..The original Edgewater buffer was replaced by the newer Colt designed buffer with the M-16. The new Colt designed buffer slowed carrier velocity (decrease cycle rate) and fixed the bolt bounce malfunction problem on full auto, but what it didn't do was have much effect on dwell time (even though it was almost 3 times as heavy) as the original Edgewater buffer..
I quote from the Black Rifle book page 202:
In the rifle, the new buffer did and didn't do several things.
First, because of the random position assumed at the end of each shot by loose-fitting internal weights and discs which compromised a large portion of the buffers mass, the effect of the buffers added weight on the rifle's "dwell time" or bolt opening cycle was negligible.
I understand the inertia forces of increased weight, but the actual effect buffer weight has on lock time has been way over emphasized IMO compared to gas regulation/port pressure/port location/ cam tract design. There is a happy medium with all things but I don't think I'm far off on my assessment..