Yeah, but the breechface is also a massive chunk of Zamak too. Can anyone who's opened one up tell me that, or if, the area of the slide from the breechface rearward only has the hole/channel for the striker mechanism, i.e. it's not hollow?
Again, the forces to worry about are the tensile forces on the slide around the ejection port. Zamax is brittle, meaning it resists compressive loads... it's not like powdered Zamax is going to squirt out from around the case head anytime soon.
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