I'm looking to loosen the recoil spring tube nut on my M4.
It's No. 50 on the schematic here:
Can anyone tell me what the size of the nut is? I don't have the right size wrench and don't want to mess it up. I also don't want to bring my shotgun into Sears so I can try out different wrenches.
I ask because I need to rotate my recoil spring tube. From the factory, it's rotated a little bit from the true center, which puts the C-stock off at an angle.