Probably the benchmark of the inspector who checked it out after it was completed.
the slide rule
Remove the barreled receiver from the stock and then remove the screw from the left side of the receiver. The bolt will slide out.
Slide the Top Lever to the right to open the chamber. Turn the shotgun upside down. Look at the end of the barrel between the receiver and barrel. Get a flashlight and you'll see a series of numbers stamped in the bottom of the barrel.
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Remove the screw that is above the bolt on the receiver. This screw holds the bolt into the receiver and once it is removed the bolt will slide out.
The Slide Rule
I think you might have to slide your finger on the ice.?
Make sure the shotgun is empty. Look in the chamber and the magazine tube. Pull the slide back and remove the end-cap and then the barrel needs to come off forward and out of the receiver. Slide the forearm forward and reach a finger into the right front side of the receiver. You will feel the right side cartridge guide. Push that up against the right side of the receiver wall while sliding the forearm forward and the forearm will come out of the receiver along with the bolt. Assembly is in reverse order.
your 1911 was made by Colt in 1914. if your slide is marked 'springfield' it is the wrong slide for your Colt 1911. however, the wrong slide in use is not unusual.
it was made by Colt in 1918. If there is a springfield slide on the gun the it was put there later on. Not unusual to see a springfield slide on a colt receiver
The serial number in modern guns is stamped into the portion of the gun that is considered the receiver by the ATF where it will be visible. For most steel pistols this would be on the side of the frame If the gun has a plastic frame, such as a Glock pistol, a strip of metal is stamped with the serial number and is molded into the frame. For some pistols, like Kel-Tec, the receiver is not the frame but the metal frame insert and the serial number is on the rear of the insert under the hammer slot. On revolvers the serial number is usually stamped on the butt portion of the frame. Sometimes grips need to be removed to see it. Sometimes the serial number or the last digits of the serial number are also stamped onto other parts of the gun, such as the slide, to identify the parts as belonging to that particular gun, however, the only serial number that matters legally is always on the frame.
Place your Phone in your pocket slide the headphone up you shirt/Tank Top and side on of the headphone out put it in your hands and slide your hand up to your ear and enjoy