Hi im going to tell you how to build a full size browning automatic rifle out of lego.
you will need lots of lego bricks for this gun and also this gun is a model and can not shoot.
it has lots of moveing parts like a bolt,ejecting port ,stock plate. flip up rear sight and tripod that is optional.
Step 1: Stock
Try to copy thes picteres the best you can im not going to post them brick by brick.
You don't have to use the same brick but as long as you have the same shape.
Step 2: Barrel,gas Pipe, and Front Grip
Same as before make same shape don't have to use same parts .
Step 3: Receiver and Back Flip Up Sight
Copy these and use the same bricks in the photos.
Step 4: Puting It Together and Tripod
Step 5: Your Done
Sorry that some some pics are bad.