Brocock commander mk1

Hi all hope everyone is well,

I have an issue with my brocock commander. I went out the other day to get some furry friends and i stumbled upon a problem. I lie there i take my first shot, no problem… i go to cycle the mag (pull bolt back and it jammed. I had to put stock into my chest and yank on bolt for it to go far enough to get mag out. Anyways i got home and managed to get it to cock with ALOT of pressure applyed. But when it is cocked the bolt free floats just like it should. Has anyone had this issue and if so what was your fix. Ohh its a .177 if that makes any difference. PLEASE HELP.