Mossberg 930 FTF HELP!!

D

damullet

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I recently bought a mossberg 930 (roadblocker). I heard these shotguns had a break-in period before they would perform to full potential. So i shot 250 1 ounce 2.75 #8 target loads in it.


I would get about 50-50 reliability. The shell extracted just fine but they would get caught feeding ,either in the locking lug reassess, or in the sharp edge of the start of the chamber.

I took the gun apart, polished both these surfaces and cleaned.
I just got back from the range and shot 250 1 and 1 1\8 2.75 #4 heavy load.
I was getting about 80-20% reliability.


Sorry for the long post but i was hoping to tap into the well of knowledge in this forum.

Any ideas?
 
The break in is supposed to be with heavy game loads....3" shells, 00Buck, slugs, etc.

I shot a few boxes through mine....and it worked fine after that.
 
Like with benelli's you need to lube it well during the break in and use shells higher then 3 Dram
 
I agree with the above comments. I have a 930 SPX and was informed it did not cycle light loads well. I picked up a couple of boxes of heavier stuff (#4) and ran them through. Then alternated from #8 to #4 for another box of each. It cycles perfectly now, with no failures to feed or eject.
 
It should have been broken in long ago. Check that the piston rings are oriented correctly. Does the bolt open and close smoothly, without excessive effort? Is the action link seated correctly? Is the trigger group clean?

That's very odd that shells would get hung up on the locking lug recess while loading. That might be the main clue there.
 
I'll repeat, get a flat of brass hulled AA's (light target load) If you have one single hang up you can call me a ####.

Also, remove the piston rings and clean out any crud under them. If there is too much carbon built up under the rings the piston can jam/stick in the gas cylinder. This happened on mine but it took a few thousand.

Hope that helps :)
 
Are you missing any pieces when you detail strip it?

Refer to this image:

3247_29_15-mossberg-930-assembly.jpg
 
TACTICAL111 said:
I'll repeat, get a flat of brass hulled AA's (light target load) If you have one single hang up you can call me a ####.

Also, remove the piston rings and clean out any crud under them. If there is too much carbon built up under the rings the piston can jam/stick in the gas cylinder. This happened on mine but it took a few thousand.

Hope that helps :)
Click to expand...

It sounds like rounds aren't feeding, not ejection issues that would be common with break in, or light loads, and ejection issues.
 
Shoot some heavy 2¾" and some 3" loads for comparison.

~~~

The light loads, especially the really light loads, just don't work well in many magnum semi-autos. In addition, the short 18.5" barrel loses gas pressure much faster than a 24"-28" barrel. Combined the gun is just struggling to function. Now add a soft recoil pad or a loose-to-the-shoulder hold and it's harder again for the gun to cycle.

The gas pressure should be pushing the bolt all the way to the rear, light loads tend to short stoke. Even though extraction/ejection occurs the bolt has not compressed the action spring enough to use the full force of it's power to feed the next shell.

~~~

There may be nothing wrong with the shotgun, just an incompatibility between the gun/ammo/shooter. Use ammo with a greater Dram Equivalent and/or ounces of shot to see what will function. Hold the gun a little loose-to-the-shoulder and choose an ammo that still cycles the action reliably.
 
Did all that.

High brass, heavy field, 3" duck load, slugs.

All the same result.

I think I have to come to grips with the fact I might have a lemon. Between this and the tactical lever action, the nightrain, and chainsaw, mossberg lost my buisness.
 
Mine did that too.

Was making me crazy trying all the fixes you have.

I took out my mag spring and cut and inch and a half off of it and then stretched it back out to it's normal length. (I also had an extra spring to play with)

For me, problem solved.

Another indication to see if you have the same issue I did,

Load up the mag and then "push" the rounds all the way to the muzzle end with your finger or another round. With mine the rounds would stay stuck in the mag and not feed. This was the spring being over compressed and getting all bound up.

Mine would feed a round when I pulled the cocking handle back and then due to too much spring pressure push the rounds in the mag to the back of the gun. (so one round was ready to load, but the round behind it wouldn't let it as it was applying pressure and sticking out of the mag)

Shotgun now works perfect and I'm not cranky at Mossy's

Sometimes little things happen and they need to be tickled. Don't let this push you off the Mossberg line, I love all the ones I own and have owned.

Let me know if this works!!!!!

I also had a friend call Mossberg and question why the gun wouldn't fire light loads. They told him to leave the action locked to the rear for a week or two to weaken the spring. I did this too and saved on lots of ammo trying to "break it in".

Hope this helps and good luck!!!!!
 
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