As far as a sling....get a hold of Kevin Swanson at
www.ustacticalsupply.com
I own 4 of them. The quick release feature is great and the nylon thick and soft......other slings I had damn near cut me.
I also own a Rem 1187P.
Had a complete nightmare with it.
First one was a complete lemon and after 2 months at an "Authorized Rem. Repair" shop it was returned to me in worse shape than before.
Insisted on a new shotgun and Remington finally agreed.
Didn't even fire the replacement when it arrived......shipped it out for major modifications....(Vang, etc...) My gunsmith get's back to me saying it can't be Vang'd because the bore's too big. I just replaced the barrel out.
Among the g-smiths I've talked to all agreed the Remington quality has taken a dive.
Break that gun in properly.
Find a good heavy 00 buck it likes.
Put 1000 through it.......
.......oh yah, save your receipt!
Good Luck.
M Guber