If you can't find an owner's manual, you will need to take it to a gunsmith.
First you need to remove the two long flat-head screws that hold the stock in place. Then remove the hex screw in front of the magazine well. This should allow you to separate the upper from the lower. Then remove the screw on top of the reciever that holds the rear sight in place; that screw and one of the screws for the stock both hold a block of metal in place that closes off the rear of the reciever. Once both of those are removed the reciever plate should come out. it might be wedged and need some extra work for removal. Be careful when removing the end of the reciever; it is under tension from the recoil spring, so when it comes loose it may fly out. The next step is to remove the bolt. Slide the bolt to the complete rear of the reciever, where you will be able to slide the charging handle completely out. Then the bolt will slide out. I hope this helps. This was the process for my Commando Mark III. It should be similiar to the commando mark 45. I think the only difference is the kind of magazines they take.
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