Sight adjustment on 930 Mossberg.

M

masshunter

Active member
Just put a turkey Barrel on my 930 Mossberg, love the feel, groups good, feels good, but POI is 8" high from POA. Rear sight is all the way down. The sights are a sort of a spring steel friction grip on the rib, and I wondered if moving the rear sight back, and giving a longer sight radias would help ? I love the low profile and the way it comes up, and would love to keep those sights. I tried it with 5 different loads, from 1 7/8 3" mag to 1 1/8 Paper AA #9. All were the same except the skeet load was more like 4". I have a set of Tru-Glow that I took off another gun, put it just gets my head up a little. Would raising the front sight a little help ? Thanks for any suggestions.
 
I was hoping someone had an idea. Maybe new sights are the only answer, I was just hoping there was something right in front of me I didn't think of.
 
I am not familiar with the rear sight on the 930, so I can't comment on it. The rule for sight adjustment is to move the rear the direction you want to move the group and to move the front sight the opposite direction, so a taller front bead will help.
 
While I would like to offer you some helpful advice, my 930 has the ghost ring sights and they work perfectly. I really like this shotgun and am going to send the barrel to Calson's for choke installation work. It a real keeper!
 
Thanks, I have the sight as low as it will go. These are a real simple sight low and snap onto the rib without those tiny screws like on the Tru Glo, and at least for me have a great picture, just shoots too high. I'm not much of a shotgun guy, and wondered if maybe some of the trap shooters out there would know if raising the comb would raise the POI.
 
Is the center of the pattern only 8" high at 40 yards?

Having a shotgun shoot a little high can be very helpful because you don't have to cover what you are shooting at to center the pattern on what you are shooting at.

Raising the front sight should lower the pattern.

For shooting turkeys in the head I would rater have my shotgun shoot a little high than be dead on at 40 yards.
 
If you lower the comb of the stock you will lower point of impact. There is a mathematical formula out there for that but I don't remember it off the top of my head. You can raise the front bead or put a larger bead up front and lower point of impact. Trouble with a larger bead is that it covers more of the target and attracts the eye. Focusing on the bead is a sure way to miss a moving target. I'd never be satisfied with a point of impact 8" high at 40 yards. I like my guns to throw a center dense pattern to point of aim 60/40 preferably at 40 yards but I can live with a 50/50 pattern.
 
Thanks to Moto, Derby, And GC, I've moved sights around on rifles, but was stumped on this one.







Thanks, Moto, Derby , and GC, 3" would be OK., 8 " is not. I'll make it work with the tru - glo/ .
 


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