Meanwhile in January 2022...I have not used my M2 often, but after I cleaned and lubed it the first time (disassembly-reassemble) I had no problems, nor after shooting it, cleaning it, etc. Recently, I took it out and shot a box of birdshot with it. It worked flawlessly. So, to clean it again, I took off the fore end cap, took out the parts inside the magazine tube, pulled the bolt open and I got stuck. The fore grip refused to slide out. I followed the manual exactly. Gotten very frustrated. Any suggestions?