Step 5: Tips
OK so you probably realized that there are some major leaks.
Just bundle them up with a ton of duct tape.
Also, the ball valve is very stiff. Put a few drops of handyman grease on the valve, (not too much!) and it should be fine.
Also, you can create a ring sight like the one in the picture. If you have any questions or things I could update, post them in the comments.
Due to the screwed up trigger system, I will be posting a new instructable on a very reliable sniper rifle with an extremely smooth trigger that I built already.