Mossberg 500A hard to rack with new barrel

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ddudeck

Inactive
I have a Mossberg 500A 12ga that came with a rifled & vented barrel. Since I use it mostly for home defense I purchased a used 20" smooth bore barrel with rifle sights. When I install the new barrel, it takes a lot more effort to slide the forearm fully forward. The forearm moves freely but there is resistance the last ½” or so. I've compared the ends of the two barrels and they look identical.
Any suggestions on what is causing this and how to fix?

Greatly appreciate any help!
ddudeck
 
Cycle the action a hundred times or so with no ammo and look for rub marks on all the components... Forend may be rubbing barrel or tube or something...
After the hundred cycles, look tear it down and look for rubs where all the action parts mate up...
Brent
 
Take-off the forend's endcap and reinsert the barrel to ensure it is fully seated. Cycling the action also works to speedup the breakin period.
 
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