09-01-2014, 02:02 PM
The magpul block looks like it would combine the advantages of the reaction rod and some aspects of the ones that hold the receiver. IE: It should keep major torque off the index pin/notch as it appears to prevent the upper from rotating as well.
Given it's polymer I wonder how much flex, but I'm not in the 80lbs of torque camp so it could be OK... I torque to a minimum then additional torque enough to align the gas tube.
Thinking about it, seems like a reaction rod type could have an insert made for the receiver that you'd secure with a pin. Do the same thing, keep the receiver from rotating.
Given it's polymer I wonder how much flex, but I'm not in the 80lbs of torque camp so it could be OK... I torque to a minimum then additional torque enough to align the gas tube.
Thinking about it, seems like a reaction rod type could have an insert made for the receiver that you'd secure with a pin. Do the same thing, keep the receiver from rotating.