You build your own AR-15. Cool. Suppose it's not made of Lego.
btw, i am confused about why you are calling your revolver and your assault rifle sentry guns.
First off, it's not an assault rifle. Assault rifles can be semi auto/full auto and/or burst, my AR only fires semi auto, so it's considered a sporting rifle. And I consider them sentry guns because they help me deny anyone to enter into my house, anyone unwanted that is....