From your own description, this sounds more like a Fail-to-Fire problem or a Fall-to Extract problem, not a Fail-to Feed problem.If any one is familiar with this model I need help correcting a feed problem.
Assuming its not what Huggy suggested in post #4, I would be looking at the trigger,disconnector, sear and related parts.What is worn/out of adjustment?
Don't think there is any problem with your feed mechanisms. From your description they seem to be working exactly as they should be!!!the cut off in the magazine/feedramp assy is free and seems to hold a round in position (as it should untill the bolt retracts).I need input on this one, suggestions please!!!!!!!!
When you pull back the cocking knob, the hammer should stay back. You can visually check this by looking through the cocking knob slot. The last 7/8ths of an inch should be "empty", except for the mainspring plunger (5/32" dia approx) and the mainspring itself.(maybe 3/16" OD) If there is something behind the bolt that is the same approx dia. of the bolt, then the hammer is not staying back. There can be several reasons why that may be so....When loading this rifle I have the bolt closed and feed rounds into the stock cutout, it loads fine; when I pull the bolt to chamber a round, the first round (even if single round is loaded in tube mag.) will litterally jump from the end of the feed ramp into the chamber & often fully chamber itself. When this happens, the bolt closes on a chambered round and will not fire,
First very carefully inspect the mouth of the chamber. Is there a burr at 12 O'clock??? A burr can cause the round to not eject, causing the problem you described. If there is its most likely been dry-fired too much. You will need to remove the burr. A worn extractor could also cause an unfired round to not be extracted. Grim and grundge packed under the extractor = the same result. The metal of the bolt face displaced into the extractor slot, causing a binding extractor = the same result. (This metal displacement into the extractor slot is normal in "high-mileage" semi-auto Mossy's.) Worn or impeded extractors usually only cause a problem with extracting UNFIRED rounds. Hope this helps!!!!...I pull back the bolt and the round will not extract, the next round jams it's nose against the first (I have to remove this round which is partially in the chamber with a knife blade or screwdriver tip) and close the bolt again; now the first round will fire and the rifle will function as intended.
The round "jumping" into the chamber is normal for the rear tube fed Mossy's. If the round doesn't fully chamber the bolt will finish the job of fully chambering the round. So no problem there!!!I should have clarified, the firearm is cocking during the manual (first round) loading ; it is not firing the round (click and no bang). I am going to disassemble (again) and check as per your suggestions. Thank you to all for the input.
I do have one question remaining...... is the spring pressure from the tube magazine supposed to force a round from the feed ramp toward/into the chamber or is the bolt to pick the round up on it's closing stroke? As I mentioned in my first post, the first round is being forced (jumping) from the mag into the chamber ( I have not noticed this on firing remaining rounds, but I admittedly did not look once the rifle was firing) What would a normal round feed be in this rifle? Having a round jump into the chamber is strange (even in a Mossberg).
Aw come on!!! Where is your sense of adventure?? I like to keep to a 6x5 piece of pressure treated in front of the muzzle when testing with live rounds!!! As I am a member of the "unintentional indoor shooting club".I took the rifle down and found burrs on the rear of the firing pin, removed them with a file so that is smooth. I also found a metal shaving/burr built up in the extractor groove at the rear of the barrel. I am going to clean/clear the groove and try to cycle a few rounds by hand ( carefully!! I do not want to join the indoor shooting club).
Hmmmm, then it appears that you have a broken firing if you don't have a square notch at the back end of your firing pin. The firing pin should be captured by the hammer and move with the hammer.I will look again, but from memory I do not recall a notch in the firing pin, gotta check that out.
Nah man thats way cool, the way those rear tube fed Mossy's spit that round into the chamber!!!Glad to know the feeding is "normal" (what ever that is) for this gun, still it is a little wierd.