Removing a solved choke and installing an interchangeable choke device on a Remington 870

February 19, 2014Bill MarrGunsmithing0


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I start by identify the dimension of the bore utilizing a boring gauge. This gauge has a .700″ standard that the indicator is zeroed to. The reading on the indicator is included to .700″ for the boring diameter. In this instance the bore was .729″ (.700″+.029″) and the choke in ~ the muzzle to be .715″ (.700″+.015″).

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I’ll be removing the choke v an angle widening choke reamer. The reamer uses two bronze bushings to guide it in the boring of the shotgun.
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The reamer is readjusted with 2 opposing screws over an angled guide. Together the chisels are moved towards the rear of the reamer, the reamer expands. Together the knives move towards the former of the reamer the cut diameter decreases.
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Here is a view of the setup used to remove the choke. The two bushings space secured in place using e-clips supplied with the reamer. The barrel is secured in a vise v bronze jaws. The reamer, coated with Do-Drill oil is gradually turned to remove the addressed choke.
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The reamer is propelled by a large t-handle. The collection up is quite long, perfect for the longest sporting barrels.
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I take light passes, cleaning away the chips and lubricating the reamer after every pass.
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After the final pass the throttle is removed.
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I am currently able come fit the bronze pilot because that my choke tube reamer into the bore.
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Here is my reaming set up top top the lathe. The barrel is pushed by the four-jaw chuck and secured in the stable rest. The tailstock feeds the choke pipe reamer.
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After the barrel is reamed because that the choke tubes I usage a tap to thread the barrel.
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The choking reamer squares the muzzle that the barrel once the cut reaches the appropriate depth.

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Success! The choke has actually been removed and also the choke tubes installed.

More info on choke pipe installation have the right to be found here: Choke pipe installation