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Join Date: Dec 2017
Location: Unfortunately in town
1187 have steel receiver.
Barrel tang may thin down the top area.
Then there's the sight trough, which loses a thread or two.
Guys building autos for deer hunting looked hard for the old Sportsman 12 Auto's, as they were round top and got em a couple extra threads (6x48).
There are mounts than have attachment screws not down the center, both sides at an angle.
Proly need a gunsmith to install those.
Aluminum........had no probs w Mossberg 500's D&T for scope base. Alum receivers there, but proly thicker in comparison to 1187.
Cantilever...........puts scope high, but negates any mod to receiver.
Buy a high comb buttstock. But don't be surprised if it aint high enough.
Clamshell receiver "no gunsmithing" mounts.
Will scratch up your receiver. If matte, will still show shiny after a while.
I taped the inside of mine to lessen the risk.
Some mounts of that type (Aimtech) may not have grooves fully machined. Had to clean up a couple back in the day (over a ten yr span saw at least 3 different mounts not done right in that regard). #1 Mill ------- file for the save.
Also.......the rear of the scope rail on such mounts is often at a 90 degree, and in the way of scope power ring (depending on scope).
Why manufacturers didn't put a 45 degree bevel at the rear I dunno.
I did that to several for myself and customers.
Birchwood Casey Aluma black makes the mods look factory.
On the aluminum ones, and the Remington plastic one (sits lower)......the area where the cross bolts go for the trigger group..........is a bit wide. Might be in your finger/knuckle area. Maybe not in shooting, but carrying. Could be annoying.
The Remington plastic mount sits low, but is cheap where the hex nuts go into pockets for the cross bolts.
Best to take up the slop w epoxy.
Idealist beaten into realist... with just enough spite left to speak my mind when least appropriate.