Kayback
Member
Your bolt assembly should slide easily out the back of the upper. Test the slide action of the bolt/rails. Hopefully the rails didnt get damaged and it's something simple.
Mine doesn't. When it goes in the upper it clicks into place and to get it out requires a little bit of grunt. This is even after how many strip downs.
I may be doing something wrong, but the first time I did it I followed the manual to the T. I still do it like that.
KBK