Dillinger is correct. If you would like to look into it further. Go to the above Search Box and type in Barrel Twist and hit GO.
Then scan down the topics and you will see a section titled "Understanding Barrel Twists" Maybe that will also help.
The Constitution is not an instrument for the Government to restrain the people. It is an instrument for the people to restrain the Government!
Today, we need a nation of Minutemen, citizens who are not only prepared to take arms, but citizens who regard the preservation of freedom as the basic purpose of their daily life and who are willing to consciously work and sacrifice for that freedom."
-- John F. Kennedy