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Mossberg 930 JM and the stock shims/spacers


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#1 jasonk_jasonk

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Posted 04 April 2012 - 09:25 PM

Picked up the new 9+1 930 JM, well done for the price it seems, looking forward to shooting it.

So it came with 6 or 8 stock shims to raise or lower the comb, etc etc.

Wondering how I should use these? Am I looking for a particular sight view down the rib to the bead? Or do I use them once I've shot the gun and see where POI is and adjust from there. If I use to adjust POI then which way do I go? If hitting low then do I raise the comb?

Thanks for any insight.

Jason

#2 benny hill

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Posted 05 April 2012 - 05:09 AM

Your gun will probley shoot high. Shim it to the lowest one and if it does not work, move the clamp, and if it does't work, bend the barrel.
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#3 bigcraig

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Posted 05 April 2012 - 01:50 PM

I put 200rds thru mine, flawlessly I might add, and felt I needed to install the .250 drop shims. The gun feels better when shouldered, now.

#4 E53X5

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Posted 05 April 2012 - 05:51 PM

I put 200rds thru mine, flawlessly I might add, and felt I needed to install the .250 drop shims. The gun feels better when shouldered, now.


I think I need to drop my stock a little, too, and the .250 is the only drop shim available. Now, there is a set of plastic shims (that I'm assuming go between the receiver and the stock), and then there is a set of metal shims that look like they go on the tube inside the stock. Are they supposed to be used together (i.e. a plastic .250 shim along with the metal .250 shim), or do they serve different purposes and you only need to use one or the other?

#5 bunsen27

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Posted 05 April 2012 - 09:48 PM


I put 200rds thru mine, flawlessly I might add, and felt I needed to install the .250 drop shims. The gun feels better when shouldered, now.


I think I need to drop my stock a little, too, and the .250 is the only drop shim available. Now, there is a set of plastic shims (that I'm assuming go between the receiver and the stock), and then there is a set of metal shims that look like they go on the tube inside the stock. Are they supposed to be used together (i.e. a plastic .250 shim along with the metal .250 shim), or do they serve different purposes and you only need to use one or the other?


You need to use both the plastic and metal shims. There should be a diagram in the instruction book on how to install them.

#6 jasonk_jasonk

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Posted 06 April 2012 - 03:44 PM

Thanks, Guys. Hope to get it out this weekend and report back with results.

Jason

#7 Nuke8401

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Posted 06 April 2012 - 04:33 PM

Now, there is a set of plastic shims (that I'm assuming go between the receiver and the stock), and then there is a set of metal shims that look like they go on the tube inside the stock. Are they supposed to be used together (i.e. a plastic .250 shim along with the metal .250 shim), or do they serve different purposes and you only need to use one or the other?


You use both a plastic shim(wedge)between the stock and reciever and a steel shim (offset hole plate) under the buttplate on the end of the buffer tube. The plastic shim/wedge just makes for a good fit between the stock and the reciever while the steel shim moves the stock up/down.

You may want to check your length of pull, mine was too short causing my head to be too close to my thumb and too high (seeing the top of the rib) even with the stock shimmed down.

But then again I don't know much about fitting a shotgun.

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#8 E53X5

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Posted 06 April 2012 - 05:17 PM

Now, there is a set of plastic shims (that I'm assuming go between the receiver and the stock), and then there is a set of metal shims that look like they go on the tube inside the stock. Are they supposed to be used together (i.e. a plastic .250 shim along with the metal .250 shim), or do they serve different purposes and you only need to use one or the other?


You use both a plastic shim(wedge)between the stock and reciever and a steel shim (offset hole plate) under the buttplate on the end of the buffer tube. The plastic shim/wedge just makes for a good fit between the stock and the reciever while the steel shim moves the stock up/down.

You may want to check your length of pull, mine was too short causing my head to be too close to my thumb and too high (seeing the top of the rib) even with the stock shimmed down.

But then again I don't know much about fitting a shotgun.

David E.

Thanks, David. The LOP is a little too short for me, too, but I think adding the drop shim will make it pretty close. I've never fitted a shotgun before, either, but I've spent a few hours reading about it and watching YouTube videos, so at least I have a rough idea of what I need to be looking for. I've seen somewhere that you're supposed to have about 2 fingers gap between your nose and the thumb of the strong hand, so it's something you could check for to see if your head is too close to your thumb.

#9 landshark45

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Posted 06 April 2012 - 07:10 PM


Now, there is a set of plastic shims (that I'm assuming go between the receiver and the stock), and then there is a set of metal shims that look like they go on the tube inside the stock. Are they supposed to be used together (i.e. a plastic .250 shim along with the metal .250 shim), or do they serve different purposes and you only need to use one or the other?


You use both a plastic shim(wedge)between the stock and reciever and a steel shim (offset hole plate) under the buttplate on the end of the buffer tube. The plastic shim/wedge just makes for a good fit between the stock and the reciever while the steel shim moves the stock up/down.

You may want to check your length of pull, mine was too short causing my head to be too close to my thumb and too high (seeing the top of the rib) even with the stock shimmed down.

But then again I don't know much about fitting a shotgun.

David E.

Thanks, David. The LOP is a little too short for me, too, but I think adding the drop shim will make it pretty close. I've never fitted a shotgun before, either, but I've spent a few hours reading about it and watching YouTube videos, so at least I have a rough idea of what I need to be looking for. I've seen somewhere that you're supposed to have about 2 fingers gap between your nose and the thumb of the strong hand, so it's something you could check for to see if your head is too close to your thumb.

How tall are Yall? Always seems to be a link between height and LOP.
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#10 E53X5

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Posted 06 April 2012 - 07:11 PM

How tall are Yall? Always seems to be a link between height and LOP.

About 6.3.

#11 landshark45

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Posted 06 April 2012 - 09:01 PM


How tall are Yall? Always seems to be a link between height and LOP.

About 6.3.

Thanks should be fairly close for me. I'm 6' even.
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