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LHshooter

Replacement Front Sight for a Mossberg 930 JM PRo?

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I've had a Mossberg 930 JM Pro for about 6 months and finally patterned it to see exactly where it is shooting. I found that it shoots high even after lowering the stock with the factory-supplied shims. So, I would like to raise the front sight by replacing the factory sight with an aftermarket, but have not been able to find one.

Anyone know of an aftermarket fiber optic front sight I can put on the JM Pro? I believe the factory sight screws off, so ideally I would like a taller sight that I can screw in, rather than gluing a sight to the rib.

Thanks in advance for any info.

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GunCat   

The Hi Viz Comp and Tri Comp are popular front sights and they come with an assortment of attachment screws including a 5-40 (Mossberg standard thread size).

The Mossberg factory bead is rather large/tall, not sure the Hi-Viz will really be that much taller unless you place a shim underneath it. Having the vent rib dovetailed (it’ll need a shallow cut) for a rifle or pistol front sight is another option

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mpom   

Think I used the Tru Glo 950 to solve the exact same issue. Really tall and much smaller fiber optic rod.

Mentioned the item# in the mega thread on the JM930 in case I am giving you wrong info.

Mark

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Jcjtspec   

On a related note, how do you remove or adjust the factory fiber optic front sight on the jm pro? My front fiber optic sight came crooked from the factory. I'd like to rotate it clockwise by 20 degrees or so.

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GunCat   

Does it look like this one? If so it is screwed into the vent rib, just twist the whole thing (the parts sitting on top of the rib)

(picture borrowed from Google image search)

SANY0027.jpg

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GunCat   

I use a small machinist clamp - but a pair of pliers with a tape, or piece of pop can, shimming the jaws (to prevent scratching the bead or rib) is really all it takes. Then its rightly tighty, lefty loosey.

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