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Take out the trigger assembly first then attempt to remove the magazine. Mine was very tight at first and had to lightly tap it from the top down with screwdriver and cloth to remove. 20x later I can remove with fingers alone but its still pretty tight.
To take your fixed magazine out you have to RETRACT THE BOLT AND LOCK IT TO THE REAR first.
Unless you do that the mag will be stuck there because the MAGAZINE FEED LIPS PASS IN TWO OPPOSITE SLOTS IN THE BOTTOM OF THE BOLT AND ARE CAPTIVE.
Either get the receiver cover, bolt carrier and bolt out before getting the trigger assembly out (remember: SAFETY LEVER ON) or get the trigger assembly out, retract the bolt fully to the rear and tap the mag rearward just a little while pulling outward.
That should do.
Good luck and don't pry off anything!
PP.
Where the round can be unintentionally fired (without pulling the trigger) when it is fed into the chamber because the free floating firing pin is stuck/obstructed in the forward position and hits the primer too hard. Never happened to me but I make sure to keep the firing pin very clean so that it rattles back and forth when you shake it.