Originally Posted by Tripod88
So is the critical bolt any better than the gold member? Anyone know where to find a 4b bolt?
About the same, except the RSF has a pad on the bolt face and should be softer on paint; efficiency should be about the same, try to get the thicker critical bolt guide, that'll help with efficiency a little more.
You'll have to look long and hard in the BST's for a 4B, not many people that have them are willing to let them go.