primers for AR-15

I think I will pull the trigger with the safety on and then use the bolt release to chamber a round with the safety on fire.
Have not tried that yet. Will advise if I get a repeat.
 
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Those words put this whole issue into a pretty good perspective concerning reality versus myth....



Well, what exactly is the reality vs. the myth?

The reality is the military specs arsenal primers for NATO 5.56 mm ammo.
The myth is what?

Just wondering. /ubbthreads/images/graemlins/confused1.gif



The myth is that the kind of primer is responsible. The reality is that poor reloading techniques (high primers) and or an unkept weapon is the likely cause far ahead of a primer defect.

If arsenal primers were so important in an AR, why do reloading manuals recommend regulars primers of various makes? They must be stupid to do such a thing now that we all know arsenal primers are required.

Do we need to crimp the primers for our AR's also, or is that a military requirement that is waiting to kill all of us who have shot AR's for years without problems with properly reloaded ammo...?

-BCB
 
It was brand new brass. Necked down 6.8SPC to 6MM.

Shot again this evening with the same lower and upper. Single fed each round. No issues.

I hope it never happens again.
Take care
Kelly
 
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The myth is that the kind of primer is responsible.



Well, that wouldn't be a myth. The arsenal primer is designed to minimize the chance of slam fires in military rifles with floating firing pins.
That would be a fact.


I think the original question was "do you have to use the military small rifle primers "

Hasn't everybody said "no, you don't"?

But there's a reason for arsenal primers in ARs, or they wouldn't have made them, would they?

This is not my quote, I copied it from another board (so when it says "I", it's actually not me).

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I asked CCI. They didn't completely answer my question but gave some helpful information:

I asked:

Is it really necessary to use an arsenal primer for an AR15 type rifle
or will your magnum primer perfom nearly as well?


They responded:

Ballistically, these two primers are the same.

However, there is a differnece in the 'design' of an arsenel type primer
(say, the #41 primer) versus a CCI 450 Magnum. In the #41 primer, there
is a greater distance between the tip of the anvil and the bottom of the
primer cup. This feature helps to prevent slam fires in military style
semi-auto firearms. The same goes for large rifle, CCI#34 versus a CCI
250 primer. Linda



So there ya go. It's a SR Mag. primer with the anvil designed to tolerate more firing pin penetration before it ignites.

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This feature helps to prevent slam fires in military style
semi-auto firearms.



See? "Helps to prevent".
 
Good info, Evil Lurker.

Following info from CCI's Web page:

Quote:
CCI® No. 34 and No. 41 MILITARY RIFLE PRIMERS


Military-style semi-auto rifles seldom have firing pin retraction springs. If care is not used in assembling ammunition, a “slam-fire” can occur before the bolt locks. The military arsenals accomplish this using different techniques and components—including different primer sensitivity specifications—from their commercial counterparts. CCI makes rifle primers for commercial sale that matches military sensitivity specs that reduce the chance of a slam-fire when other factors go out of control*. If you’re reloading for a military semi-auto, look to CCI Military primers.
*Effective slam-fire prevention requires more than special primers. Headspace, chamber condition, firing pin shape and protrusion, bolt velocity, cartridge case condition, and other factors can affect slam-fire potential.




As noted above, sensitive primers do not necessarily cause slam fires, but can contribute toward the problem given any number of other conditions.

Regards,
hm
 
Good info, indeed. But I think you guys are reading into it a bit. On BCB's side, all he stated was that the primer is not responsible. Technically, he is still correct, IMO.

In other words, yes the military style primer with it's thicker cup may help prevent slam fires, but the primers themselves are still not the CAUSE of them.........
 
Evil Lurker:

I hate to say this but the information you posted is not new to many folks. Maybe it was to you, but, sorry .... So don't get overly excited with your "See" and "So there ya go" chest thumping.

Quote:
Good info, indeed. But I think you guys are reading into it a bit. On BCB's side, all he stated was that the primer is not responsible. Technically, he is still correct, IMO.

In other words, yes the military style primer with it's thicker cup may help prevent slam fires, but the primers themselves are still not the CAUSE of them.........



Using 2MG's comment as a back drop, it is exactly what I was saying. If you reload a round of 223/5.56 ammo and leave a high primer or if you have a dirty rifle with a firing pin that does not move freely fore and aft like it should as the bolt cycles, you are asking for a slam fire. And a military spec arsenal primer with captain's bars in full battle dress camo's ain't gonna' stop it from happening.

Eugene Stoner's design is inherently safe. If it wasn't it wouldn't still be around after 40 years of military service. But even Stoner couldn't engineer out careless reloaders and poor rifle maintenance and poor modifications that contribute to just about all of the slam fires that happen with an AR.

As a result, I too don't worry about meteorites. If you take care of business when loading and maintaining your AR properly, you won't have to either.

-BCB
 
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So don't get overly excited with your "See" and "So there ya go" chest thumping.




Get out of my face with that attitude.



LOL...! They're your words, not mine....

-BCB
 


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