my ? is i have a ithaca model m- 87 deerslayer 20 in barrel . shoots 2 3/4 3 " shells . I would like to get a barrel for clay pigeons. so will only a model m- 87 barrel work . i've seen a lot of model 37 barrels that are 2 3/4 chamber with would be fine for me . but i don't no if its compatable . if anyone no the answer please let me no . love the gun . i live in south fl and its not realy fun to shoot targets . we have a small farm in western new york . for years you could only use shotgun but now they allow rifle . My Dad only hunted for years with a old ithaca 16 gauge . years back i bought the gun for him he watch me shoot it with the 3 in mag hi impact ammo and said his 16 was just fine. he also had had open heart surgery and didn't think it would be good for him .