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Old December 27, 2012, 08:17 PM   #8
Dfariswheel
Senior Member
 
Join Date: May 4, 2001
Posts: 6,825
On the Remington factory extension, the clamp prevents the extension tube from unscrewing under recoil.

On any shotgun, the clamp prevents a bump from knocking the extension off the gun.
This invariably damages the threads on the guns magazine tube, which with a Remington means an expensive trip back to the factory to have a new magazine tube brazed into the receiver and a refinish job.
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