I've seen the "pie chart" about AR ejection patterns and consider a useful guide to what *might* be the reason behind the way a particular rifle throws brass.
However I keep in mind something else I read in here that the chart is not gospel, and while ejection angle *can* be indicative of how your rifle is gassed, it is not necessarily in and of itself diagnostic, and there are other factors that can determine ejection pattern.
So aside from a straight-up overgassed or undergassed gun, or really hot or really weak ammo, what other factors contribute to ejection angle and why, and how do they manifest? For example, I've heard extractor tension mentioned as a factor in ejection angle but not an explanation of *how*?
My question stems from a gun of mine that has started chucking XM193 brass fairly far forward, at about 1:00/1:30.
However I'm skeptical the gun is overgassed. It's a BCM 16" midlength with a rifle RE/buffer/spring. This type of ejection when shooting M193 spec ammo is a fairly recent development, although I suppose with the round count (approx maybe 4k rounds at this point) perhaps I'm getting some gas port erosion now?
The rifle has been and continues to be reliable, so I'm not trying to fix a failing gun, but the change in ejection pattern is puzzling to me and got me wondering about what other things besides gassing can dictate the way an AR throws brass.
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