Question about AR15's

[alamo5000]

My question is specifically in regards to the ejector on the bolt face.

A brief rundown as I see it is the round gets stripped from the mag by the bolt. When it goes into battery the extractor slips over the case rim. The ejector is compressed until firing. The extractor holds the case rim to allow the spent case to be pulled from the chamber. The ejector is opposite of the extractor so as soon as the case is free from the chamber it helps flip the spent case out of the ejection port.

My question is how much does the ejector influence the ejection pattern of the rifle?

On my 6 ARC I have been playing with it a bit, but seems like no matter what the ejection pattern is the same.

I sent another suppressor to get upgraded baffles and upon getting it back I had to open the gas block up 2 clicks to get lock back. Now it has way less back pressure.

Also because the rifle seems to be over gassed I've tried numerous different buffers (at least 3 of increasing weight). The heaviest one is 5.8oz. I've also tried different buffer springs as well.

The thing is, as I worked my way up in those weights and springs, I could almost put a 5 gallon bucket out there at about 5:00 and caught all the brass regardless of how heavy the buffer is.

It's not really a problem per se, but I'm thinking that I might be missing something. I could definitely be slowing down the carrier itself with those heavier buffers, but the ejector spring might be extra strong. At least in theory a really strong ejector spring might cause the ejection pattern to not really respond to carrier speed changes.

In the past as everything got slowed down the ejection pattern would move and respond accordingly. This one though is a bit strange. The bolt is a Type II Grendel bolt from RCA in a Griffin BCG shooting 6 ARC.

So am I just nuts or does it sound plausible? If it's a thing to have extra strong ejector springs is it possible that has that much influence on the pattern?

It's not causing malfunctions but I am trying to fine tune everything so depending on what else I can come up with it will help me figure out the best solution.

[Joelski]

1. You're applying knowledge gained from tuning 5.56 group ammunition to a different ballgame.

2. You're way over-thinking it. 5 o'clock is ideal (for 5.56 ammo), but you're getting competent ejection and reliable extraction. Take the win.

Sent from my SM-S928U using Tapatalk

[alamo5000]

I think I have a decent hypothesis. Please let me know if I'm totally off the mark or not.

When the bolt is in battery it's completely stationary. When you pull the trigger it goes through a brief time of acceleration. During that cycle the spring pressure and buffer combined are increasing in resistance to the rearwards pressure.

With a 5.56 case vs a 6 ARC, the 5.56 is substantially longer. (Over 1/4"). What that means is the 5.56 will eject later in the process of rearwards travel of the BCG, more when the BCG is starting to slow down.

6 ARC on the other hand, the case is clear of the chamber and upper much earlier in that process. I would assume the BCG is still in it's acceleration stage when 6 ARC brass gets ejected.

In your mind maybe picture a bell curve representing the rearwards travel of the BCG. I would assume a 5.56 case will eject much closer to the top of the curve or even on the downward slope whereas the 6 ARC ejects on the upward slope. This is simply due to a shorter case.

With a regular 5.56 as you add weight to the buffer in essence it's moving the entire bell curve further forward in the sequence of things which typically results in ejection happening much more in the deceleration stage.

Am I crazy? Or is this remotely plausible?

[alamo5000]

I guess if my hypothesis is correct then I have been misdiagnosing a 'problem' so to speak.