Slam fire candidate?

chemo

chemo

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I was doing the test after assembly today and wanted to go further so I took a fired brass and covered the primmer pocket with maskin tape
untouched.jpg



Then fired the "dummy" round and bam, as expected, tape ruptured, rifle is good to go!
firep.jpg



Wanting to go further I did another (2 other actually with this method, providing same results). Chambered it and slammed the bolt shut. Here's what it looked like (no firing, just chambering and ejecting)
chambered.jpg




Now I'm perplex, the tape didnt rupture, which is good because primmers are not, and are not likely to be for the next milleniums, softer than maskin tape. Does that make this m14 a future slamfire/out of battery firing rifle?
Anyone willing to try this with a proven effective m14? Or maybe this is just normal
 
This is normal.

The firing pin is free floating (no spring to hold it back).

Also under normal conditions the bolt will not slam into the chamber with as much force as you got in your experiment because it is slowed down by the resistance from stripping the round out of the mag, and the accompanying loss of inertia etc...

Also, as you said the primer has more strength than paper, so it will only get a small dent if anything at all.

If you want to go further, put a live primer in place of the tape and repeat the experiment.
 
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Spcamno said:
X2.

I think there is a sticky mentioned before "always load from the mag and shouldn't be loading a round into the chamber and slam the bolt"
Click to expand...

I rememebr reading this too
not sure if it was on the stickies, probably is
 
another thing to be careful of with m305s if you change stocks is to watch for hammer follow- if the stock is too thick around the back of the trigger guard where it locks on the receiver. I had this happen with a repainted fiberglass stock. The cure is to hog out a bit from the top rear of the stock so it goes in a bit deeper - ie so the distance between the back receiver top and the trigger guard is reduced.
 
Spcamno said:
X2.

I think there is a sticky mentioned before "always load from the mag and shouldn't be loading a round into the chamber and slam the bolt"
Click to expand...


I remember reading this too. I think it was emphasized that this is even more important when using commercial .308 rather then 7.62x51:)
 
JohnC said:
another thing to be careful of with m305s if you change stocks is to watch for hammer follow- if the stock is too thick around the back of the trigger guard where it locks on the receiver. I had this happen with a repainted fiberglass stock. The cure is to hog out a bit from the top rear of the stock so it goes in a bit deeper - ie so the distance between the back receiver top and the trigger guard is reduced.
Click to expand...

agreed, and I did check for that hammer follow when I got the stock
I was redoing the test after changing op-rod spring guide and shimming (these mdos dont affect hammer follow but it's a good habit to test it out...)
 
I am not sure what this test proves.

You are using a fired case not a sized one and by adding masking tape to the case head you are decreasing the headspace by approx. .004 " .

I would expect to see a large dimple on the primer under those conditions.
 
the case had been sized actually...
and the test doesnt prove anything, I was just wondering
 
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