I'm building a Polymer 80 version of the G40. Lone Wolf slide with Glock internals upper and lower. Everything functions fine until I add the RSA. It doesn't matter if it's a Glock or an aftermarket RSA, the slide will sometimes bind or even jam in the full rearward position when I manually rack the slide. It doesn't happen when firing the pistol. When disassembling, the RSA will always be out of it barrel seat either partially or completely. It's obvious the problem is with the fitting of the RSA. So, my questions is, should the rear of the RSA stay in its barrel seat during the firing sequence or does it move around? I'm wondering if I've removed too much material from the frame. Really appreciate any insights anyone may have. I posted in this section hoping to avoid the negative comments some folks feel obliged to make regarding Polymer 80 vs Glock.