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Old January 23, 2020, 10:17 PM   #9
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Join Date: January 13, 2018
Posts: 1,123
I have two used police 870s. One a magnum, the other standard.
Remington says:

Model 870 Barrels with 3" chambers will fit both magnum and 2-3/4" receivers and will handle both 2-3/4" and 3" shells with a magnum receiver. (An M at the end of the serial number = magnum receiver.) Use only 2-3/4" shells when barrels are used on 2-3/4" receivers. 870 Special Field barrels and other model 870 barrels are not interchangeable. The 20-ga. lightweight barrels will not fit 20-ga. standard guns. Light contour barrels for the 870 Wingmaster have a weight reduction of more than a 1/2 lb. to improve balance, portability and handling without sacrificing strength or durability. The Model 870 Super Slug with Scope is 23" long with a 3" chamber capable of handling 2-3/4" or 3" sabot slugs. Mounted and boresighted 2-7x32 scope. Fits 870 Wingmaster, Special Purpose and Express models.
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