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Posted: 7/5/2010 12:24:22 PM EDT
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Hello,
I finally got out to shoot my AR over the weekend. It's a Spikes lower and Bravo 16" upper. I purchased a lower build kit from Palmetto State Armory which included a standard buffer. I noticed my shells are ejecting to the rear and dinging up the brass deflector. I don't care if the deflector is dinged up (I'm left handed so it's doing its job) but I wonder if I should get a heavier buffer. Someone posted a diagram of the ejection angles (toward the front, straight out, to the rear) and what caused them. Since I've got a carbine, should I have the H buffer? By the way, it shot great - not one problem. Can't wait to take it out again. Thanks, Kyle |
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It sounds like the gun is brand-spankin' new. Never gauge what the gun will do until it's really well broken in, say 2-300 rounds downrange. While it's so new, the moving parts resist movement more due to their just-made finishes not quite smoothly sliding over other just-made parts.
With that said, is the brass going forward OFF OF the brass deflector? Or is it sort of sliding across the deflector? If it's going forward off the deflector, then you're fine-you don't need to do anything about it because they're out of your way. If the brass is sliding rearward over the deflector, that's a sign of having either too little gas or too large a buffer. OR of having a brand new gun that isn't fully broken in yet. Keep it lubed, shoot it - a LOT - and after several hundred rounds see what it does. I'll bet it flings the brass in a different direction after those several hundred rounds. |
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What angle is your brass actually ejecting?
The chart you were talking about have a view looking down at the shooter with the 12 o'clock towards the muzzle, and 6 o'clock towards the buttstock. I don't have the chart but here's the content: 12 - 3 o'clock: Ejection is overgassed. Change to: heavier buffer, CS/ extra power buffer spring, M-16 auto carrier, adjustable gas block. 3 - 4:30 o'clock: Perfect ejection 4:30 - 6 o'clock: Short stroking. Corrective action: check for gas leaks, lighter buffer, lighter bolt carrier, adjustable gas block, tune buffer spring. ETA: My two carbine gas system with 16" barrels are both ejecting at between 3:30 and 4 o'clock, my setup are M-16 auto carrier, BCM extractor upgrade kit, H (heavy) buffer, and standard carbine buffer spring. |
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