no
NO! The 1187 barrel was for remington shotguns,the auto-5 shotgun is a browning shotgun.
No
No, a 12 gauge Remington 870 barrel will not fit a 12 gauge Remington 1100. The two shotguns have different designs and systems; the 870 is a pump-action shotgun, while the 1100 is a semi-automatic. Their barrel attachment mechanisms and receiver dimensions differ, making them incompatible with each other.
NO
It will fit on the frame but the action will not function with 3 inch shells.
Probably not but call your local gunsmith
no
No, the Remington Model 1100 stock has a hole (recepticle) through the inside of the stock in the pistol grip area to accept the action spring tube. The Remington Model 870 stock has no need for this hole so the 870 stock will not fit on the Model 1100 action.
No
No, a Remington 870 barrel will not fit a Remington 887. The two shotguns have different designs and specifications, including differences in the action and barrel attachment methods. While they may share some similarities, their compatibility does not extend to barrel interchangeability. Always consult the manufacturer's guidelines for specific compatibility information.
AFAIK, no.
yes it will all you have to do is to take it apart