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I've had this Mossberg 930 semi-auto 12g for a few months now. I've had it out shooting clays once and it performed flawlessly. I then bought a rifled barrel directly from Mossberg so I could use the gun for deer hunting. This weekend I went to the range to sight in the gun with the rifled barrel and my slugs.
Shot #1 with a slug felt normal when it fired but it did not eject the empty shell. The shot landed about 2 feet low, but on the paper. The red dot had just been put on the gun so it didn't surprise me that the poa/poi was off. I adjusted the scope to bring it more in line and loaded one more slug. I fired the slug and again it "felt" normal but again did not eject the spent case. The shot didn't hit anywhere near the paper which I thought was odd, it should have been closer than the first shot. I looked at the gun and the wooden forearm grip had completely split from the front to back, the top piece of wood was just barely hanging on and basically came off in my hand with the slightest encouragement. That was the end of the range trip for this gun.
Got home and took the thing all apart. Other than the wooden hand guard I could not find anything in or on the gun that appeared broken or damaged. The only potential issue I saw was with the plastic forearm retainer. It seems to wiggle around a bit. This is the guide that wraps around the magazine tube and guides the dual rods on the pusher assembly into the reciever of the gun. If it's wiggeled to the side the rods hit the side of the retainer and do not enter the reciever. If the retainer stays put then the rods go right in without issue.
Also, I took the barrel off, plugged up the breach and blew into the muzzle. The air does come right out of the gas holes, they don't appear to be blocked at all.
Any ideas what the heck happened here? Do you think this is safe to try again if I put a new forearm grip on it?
Here you can see the wiggly retainer that guides the two rods. In this pic the retainer is rotated and out of position.
Here I have the retainer in position and you can see both rods feed into the guides well.
Shot #1 with a slug felt normal when it fired but it did not eject the empty shell. The shot landed about 2 feet low, but on the paper. The red dot had just been put on the gun so it didn't surprise me that the poa/poi was off. I adjusted the scope to bring it more in line and loaded one more slug. I fired the slug and again it "felt" normal but again did not eject the spent case. The shot didn't hit anywhere near the paper which I thought was odd, it should have been closer than the first shot. I looked at the gun and the wooden forearm grip had completely split from the front to back, the top piece of wood was just barely hanging on and basically came off in my hand with the slightest encouragement. That was the end of the range trip for this gun.
Got home and took the thing all apart. Other than the wooden hand guard I could not find anything in or on the gun that appeared broken or damaged. The only potential issue I saw was with the plastic forearm retainer. It seems to wiggle around a bit. This is the guide that wraps around the magazine tube and guides the dual rods on the pusher assembly into the reciever of the gun. If it's wiggeled to the side the rods hit the side of the retainer and do not enter the reciever. If the retainer stays put then the rods go right in without issue.
Also, I took the barrel off, plugged up the breach and blew into the muzzle. The air does come right out of the gas holes, they don't appear to be blocked at all.
Any ideas what the heck happened here? Do you think this is safe to try again if I put a new forearm grip on it?
Here you can see the wiggly retainer that guides the two rods. In this pic the retainer is rotated and out of position.
Here I have the retainer in position and you can see both rods feed into the guides well.
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