Like most extension kits, the Remington factory comes with the longer spring.
The Remington factory clamp is a different design then the above pictured Choate-type clamp.
It's in the form of a shaped "U" that wraps around the extension and barrel.
The screw that holds it on also passes through a groove in the extension to prevent it from sliding forward.
Finding the Remington factory extension is a little difficult.
The best way is to find a gun dealer who will special order one for you from a factory Law Enforcement distributor.
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