Good to see Plinker is getting into the spirit of Crine Stoppers. Have a Sprite....or more adult beverage.
Spealing Policce.
Good to see Plinker is getting into the spirit of Crine Stoppers. Have a Sprite....or more adult beverage.
Spealing Policce.
Claven, you are the one being presumptuous here. From the amount of grinding I saw there was no way there was enough heat generated to cause anything coming apart. Nowhere did I say they were OK. I just pointed out the obvious that they wouldn't break off. I won't say they were in spec because I doubt they were. Whoever put those rifles together were not from anyone's armed forces and neither is Marstar. If that actually has anything at all to do with the safety of those bolts. Yes, they would be taking one hell of a beating with each firing but it would take a long time before one failed IMHO.
With the heat from the welding and the added on poor grinding on a heat treated bolt, I truly hope both lugs don't let go in the middle of a string of shots. From one pic in the other thread, it appeared 10% contact on one lug and basically 0% on the other on a bolt of questionable hardness that has to hold 50,000psi. I've seen metal fail undergoing a lot less stress than that.
The lugs don't have to totally fail to be extremely dangerous. Much of the grinding was done to welds on the bolts. The crap weld could break and hit your arm, face, eye or someone else. I've been hit by pieces of a broken hardened punch while I was walking by a coworker. I wasn't injured seriously but it hurt like hell for a while. Now picture that by your face...
Metallurgy is very involved and more than what's on the surface...
All of us who shoot Milsurp rifles take on a certain amount of risk based on where the stuff came from, who looked after it originally, and how it was stored well before the question of negligence/misuse comes up.
We can usually only visually inspect, and sometimes we gauge what we buy before we use it.
Please, if you have not already, get a really nice pair of quality shooting glasses and get in the habit of always using using them.
A good pair usually only costs the equivalent of some boxes of decent ammo.
You only have 1 set of eyes!
100% with this....I cringe when guys post videos of themselves (or sometimes their young kids) shooting milsurps with no eyes on.
These are excellent shooting glasses, starting at $60. They will stop a 12 guage 7 1/2 load at 10 feet.
https://www.amazon.ca/gp/aw/d/B000P...ion+sawfly&dpPl=1&dpID=31Akmij14xL&ref=plSrch
Claven, you are the one being presumptuous here. From the amount of grinding I saw there was no way there was enough heat generated to cause anything coming apart. Nowhere did I say they were OK. I just pointed out the obvious that they wouldn't break off. I won't say they were in spec because I doubt they were. Whoever put those rifles together were not from anyone's armed forces and neither is Marstar. If that actually has anything at all to do with the safety of those bolts. Yes, they would be taking one hell of a beating with each firing but it would take a long time before one failed IMHO.
If they were just ground I would agree. But they were welded too. The weld is what will cause the change in material properties than can (and in my opinion WILL) cause a shear crack failure under fatigue. The grinding was only done to clean up the welding!!
Claven, I honestly know how you feel about this and I don't like it any better than you do. Do you know how the weld was applied??? Was it TIG? Was it another wire feed? Was it done with rods? Was it spray welded? I don't know and I am familiar with all of these systems. All require different levels of heat and penetrate to different depths. I would suggest that spray welding would be the best way and require the least amount of heat to be generated and then only to the top few thousandths of the surface material. Whatever, the deed was unconscionable and I truly admire your ire at the underhanded way it was done. This whole issue is reminiscent of the practices that used to go on in the mid fifties and early sixties. Not good for our image at all.
This bolt would have failed very quickly.... it's the one that has about 10% total lug engagement. I agree some were not AS BAD, but every one had welding and grinding on it to correct headspace issues. Plus commercial .308 runs hotter then 7.62x51 and 30'06 so best case scenario the lugs hold, but eventually headspace grows as the lugs setback and now you have head separation which the M1 doesn't handle so well.
And really, if you consider how poorly these were ground on a belt grinder, do you really think the guy used proper welding material and technique?
/QUOTE]
No. 308 and 7.72 are loaded to about the same pressure. I have tested some hot IVI 7.62 that was over 60,000 psi and deemed to be within the allowable pressure. SAAMI and the military use different ways to measure pressure, so the numbers cannot be compared.
But to say 308 is hotter than 7.62 is like saying 100kph is faster than 60 mph. Different systems, similar speed.
I have tested guns to destruction, just to see what they will take and how they fail. It would have been interesting with one of these abortions. I would expect a lug to collapse (non-catastrophic) and the action to bind solid.
Are there any further updates on this? Did the police get involved? Was a recall finally issued? I read the first thread through but no energy to plow through another 12 pages