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Dfariswheel · May 19, 2012, 05:52 PM

Close the action and insert a rod or dowel down the bore.
Mark the rod even with the barrel, remove and measure. That's the actual barrel length.

Remember, the barrel MUST be NO LESS than 18 inches long. Note too that some states may have other standards.

"As far as I know" (note the qualifier) you can use any standard 870 barrel on the Super Mag but you can only shoot shells that the barrel is made for.
As example if you install an older 2 3/4" barrel on the Super you can only shoot 2 3/4" shells.
Since the 3 1/2" Super is WAY over powered for defense use, a standard 2 3/4" or 3" barrel would work well and you could either keep or sell the Super barrel to fund a 18" barrel.

May 19, 2012, 05:52 PM	#3
Dfariswheel Senior Member Join Date: May 4, 2001 Posts: 7,478	Close the action and insert a rod or dowel down the bore. Mark the rod even with the barrel, remove and measure. That's the actual barrel length. Remember, the barrel MUST be NO LESS than 18 inches long. Note too that some states may have other standards. "As far as I know" (note the qualifier) you can use any standard 870 barrel on the Super Mag but you can only shoot shells that the barrel is made for. As example if you install an older 2 3/4" barrel on the Super you can only shoot 2 3/4" shells. Since the 3 1/2" Super is WAY over powered for defense use, a standard 2 3/4" or 3" barrel would work well and you could either keep or sell the Super barrel to fund a 18" barrel.