Originally Posted by Totn27
Remove the slide and make sure the recoil spring is down in the half moon area all the way...
The heel of the recoil spring assembly is only
in that location during assembly and dis-assembly of the slide/barrel/RSA from the frame. When the pistol is assembled, the heel of the RSA is always
up against the polymer wall in the back of the frame dust cover, just in front of the slide lock. It does not matter how precisely the heel of the RSA is positioned against the front of the barrel under-lug during assembly because it won't be there after the slide is on the frame...if it is too much out of position the slide/barrel/RSA can not be installed on the frame.