Used shotguns with long barrels are readily available in most areas. A 28″ vent rib shotgun is great for the duck blind or goose hunting, but too long for many other hunting and sporting applications. In this post, we will look at how a vent rib shotgun barrel is cut and crowned (a screw in choke system will be installed as well).
The following items were ordered from Brownells:
- Win-Choke/Rem-Choke tap (513-044-012)
- Rem-Choke reamer (513-046-012)
- Bushings for the tap and reamer, these must be sized for your bore
- Starrett electronic calipers (749-008-013)
- Manson wall thickness gauge (513-000-066)
- Skeets shotgun bore gauge (843-200-146)
- Do-Drill cutting oil (083-007-016)
- 6-48 tap (748-001-648)
- #2 centerdrill (317-402-002)
- Angle meter (827-000-003)
All lathe work is conducted on a Grizzly gunsmith’s lathe.
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The barrel used in this post is a Remington Express 28″ vent rib barrel.
Prior to installing a Rem Choke system, the barrel wall thickness needs to be evaluated to make sure it is thick enough. This is especially critical in cases such as this where the bore isn’t centered in the barrel.
More information on determining if a barrel wall is heavy enough for screw in choke tubes can be found in Choke tube installation and Removing a fixed choke from a shotgun barrel and installing a choke tube system. Additionally, Brownells provides great information on measuring for screw-in choke tubes here.
The high-speed steel reamer used here will not cut a chrome lined barrel (which isn’t a problem with a Remington Express barrel). If you think a barrel is chrome lined, see if it takes cold blue. If it does, it isn’t lined. If it doesn’t it most likely is and you’ll need to remove the chrome lining prior to machining.
Shotgun beads are installed in both blind and through-type holes. In this case, there is ample material for a blind hole installation. However, since this gun is equipped with choke tubes, I decided to install the bead sight with a through hole since it will be covered by the choke (I avoid blind holes whenever I can).
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