Need some trouble shooting

[Huntfish]

Hey guys I'm new here !! I'm trying to set up 20ga for my dad who can't take 12 ga anymore .. I've got M2 for him 26in with Longbeard choke shooting Longbeard 3 6s its shoting way high I've got C shim in there  any help would be appreciated .. thanks ..

[Tom Foolery]

If you want sights I recommend the Williams Universal Slugger Ghost Ring

[Huntfish]

Hey guys ... I took the shim out put it all back together took it back out  shot it again!! It's right on it  30 yards put 162 in 10in ..  thanks

[Huntfish]

I'm sorry that was in a 7in not 10 ... 201.. in 10