Marv's Blueberry Muffin has suffered our first failure with the Freedom-15 lower.
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I don't think this from the stress of firing. I think this is from the mold maker putting the rear holes so they're too fucking tight on the upper and you have to hammer the take-down pin in and out.
The good news is the thread spacer method of capturing the buffer retainer worked flawlessly.
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As you can see from combining these three shots is the crack is almost all the way through and the stock is about to come off.
We decided to see how much effort it would take to finish it off. Marv says "moderate" effort from cracked to this:
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The take down pin, detent and spring all went flying! Amazingly we were able to find all three parts after a short search.
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No matter the precautions we've taken, there is no avoiding bubbles and voids with this material and mold. The set time doesn't allow for the bubbles to escape before they're permanently part of the part, and the route the material has to take to fill the mold is not simple, so there's lots of places for air to get trapped too.
I don't think this from the stress of firing. I think this is from the mold maker putting the rear holes so they're too fucking tight on the upper and you have to hammer the take-down pin in and out.
The good news is the thread spacer method of capturing the buffer retainer worked flawlessly.
As you can see from combining these three shots is the crack is almost all the way through and the stock is about to come off.
We decided to see how much effort it would take to finish it off. Marv says "moderate" effort from cracked to this:
The take down pin, detent and spring all went flying! Amazingly we were able to find all three parts after a short search.
No matter the precautions we've taken, there is no avoiding bubbles and voids with this material and mold. The set time doesn't allow for the bubbles to escape before they're permanently part of the part, and the route the material has to take to fill the mold is not simple, so there's lots of places for air to get trapped too.