@ 09:43 pm (GMT) |
Nathan FosterRe: Mossberg Patriot rifleNote to other readers, it also pays to be wary of pin 14 in this rifle and also the Omark target rifles. The pin is not solid as it has to accommodate the firing pin passing through it. Always keep an eye on the bolt head and this pin assembly (more so as the rifle gains age and wear). If the pin shears, the bolt handle can be turned down but without engaging the locking lugs.If making a new pin, it is possible to turn from soft mild steel, then case harden the outer in Casenit. Do not use a tool steel or any other hard / brittle core material. The steel must be tough but not brittle. |
@ 03:12 am (GMT) |
Thomas KitchenRe: Mossberg Patriot riflethank you for sharing another email Nathan they really do make for interesting reading.you really do have to wonder what manufactures are thinking some times. |
@ 03:37 am (GMT) |
Nathan FosterRe: Mossberg Patriot rifleThanks Thomas, much appreciated. |
@ 03:38 am (GMT) |
Nathan FosterRe: Mossberg Patriot rifleFYI, the person who emailed me is now going to move to another rifle design and start over. |
@ 05:47 am (GMT) |
Paul LevermanRe: Mossberg Patriot rifleNathan - in regards to the pin 14: this looks very similar to the Savage set-up, but I may be looking at it wrong. Is the failure common to Savages as well? There seem to be some design differences, but this drawing isn't really all that great. |
@ 03:10 am (GMT) |
Nathan FosterRe: Mossberg Patriot rifleCommon is not the right word really. It is perhaps not fully a design flaw either.In any rifle with a cross pin, you simply have to keep an eye on wear. A good example would be any target rifle running neck sized loads that take some cranking on the bolt handle, both in and out. A few barrels later and the pin may be worn, especially if it is narrow where it has been drilled through. The pin on the Savage is quite large and this is not a common issue that I know of. Not fully a rifle fault but more a factor of how we use them, how much we use them, how hard we use them. I hope I am making sense. Yes, solid construction is ideal. But then nobody wants to pay such machining costs so these are the compromises. |
@ 04:05 pm (GMT) |
Paul LevermanRe: Mossberg Patriot rifleAfter reading your note on the cross-pin, I stripped my Savage bolts and had a very close look at the pins. None had any signs of wear that I could see. The bearing surface on the bolt/pin were clean. The through hole had no signs of damage. But further to this, I started looking at the construction and found myself wondering why these pins would fail in the first place. Theoretically, there should be no forces applied to them when the gun is fired. All the force of the recoil should be transferred directly to the locking lugs. However, if your lugs are not lapped, or at least have a solid mating with their respective grooves in the action, then yes, that pin would be exposed to all sorts of forces that it was not meant to handle. If only one lug was in contact, the uneven loading of the bearing surfaces could definitely end with a failure.This is just an observation on my part, as I am definitely NOT an engineer. My Savages (3) have all seen more than their share of rounds. But, as part of the cleaning/pre-range regimen, I lap the lugs to about 80% or more if I can get it. |
@ 04:56 pm (GMT) |
Paul LevermanRe: Mossberg Patriot rifleStill wondering about that pin. Looking at it again, I see where you are coming from, Nathan. The torque applied when either jamming (camming) a tight round in, or hammering a bolt open would definitely not do that pin any good. So, between recoil and operator abuse, that poor little pin is in a pretty hostile setting. It's a testament to the companies that more don't fail. |
@ 06:58 am (GMT) |
Thomas KitchenRe: Mossberg Patriot riflei was looking into this and it appears the mossberg mvp rifles are the same design so be aware of similar issues |