I have been trying to get the BC assy to strip the round from the RPD belts but it takes 2or 3 hits to get them push from the very tight links. I have a 16" M60 return spring with about 1 1/2" of inital compression and about 6 1/2" total compression. The bolt face is about 1" from the back of the feed try at it's rear most travel. I am going to increase that a bit and get more compression and BC assy inertia. I am also going to open up the links by pushing an overside round bar into them from the side. I will try that on a few links on the end of the belt as I don't know how much they can be opened without cracking and changing the pitch of the belt.