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Posted: 6/11/2022 4:04:22 PM EDT
I've noticed that on an upper designed specifically the AR9 the ejection port cover is shorter and as a result the shell deflector is ~3/4" more forward than on a 5.56.223 upper.
 Is having the case deflector 3/4" more forward that big of a deal on an AR9? |
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Posted: 6/11/2022 4:13:19 PM EDT
[#1]
Its not a shell deflector, by design shells never hit it, its a gas deflector.
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Posted: 6/11/2022 4:21:58 PM EDT
[#2]
Quote HistoryQuoted: Its not a shell deflector, by design shells never hit it, its a gas deflector.  The Brunton bump is a shell deflector by design.
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Posted: 6/11/2022 4:41:29 PM EDT
[#3]
The one in the pic certainly looks like a "Shell" deflector. The "Gas" deflector on my Colt is something else altogether.
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Posted: 6/11/2022 8:17:18 PM EDT
[#4]
Quote HistoryQuoted: The one in the pic certainly looks like a "Shell" deflector. The "Gas" deflector on my Colt is something else altogether. Yeah I agree, I also own the Colt, the OPs pic could be something different. Maybe its designed to deflect shells where the Colts is designed to deflect gas. I know on my Colt the shells never hit the gas deflector not once. |
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Posted: 6/11/2022 8:39:00 PM EDT
[#5]
I would think that with the shorter case length and bolt throw before the 9mm case is ejected, you would want it to be impeded at an earlier point
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Posted: 6/11/2022 8:42:31 PM EDT
[#6]
It is just a marketing thing. I use a standard port with a standard door and it works just fine. I think the short door looks dumb, and if you are wanting to use the RDB system is not appropriate.
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Posted: 6/11/2022 10:06:37 PM EDT
[#7]
Quoted: I've noticed that on an upper designed specifically the AR9 the ejection port cover is shorter and as a result the shell deflector is ~3/4" more forward than on a 5.56.223 upper. https://cdn3.volusion.com/hnmuk.qprpf/v/vspfiles/photos/SP-SFT902D-2.jpg?v-cache=1654806540 Is having the case deflector 3/4" more forward that big of a deal on an AR9? That is the first AR 9mm upper that I have seen with a brass deflector like that. I can't tell from the photo if it clips in place along with the dust cover or if it is cast as part of the receiver. Which is it? I have had similar experiences as others in that I have not had empty 9mm cases hit the brass deflector (Bruton Bump) and I couldn't tell you if they even contact the gas deflector on my Colt clone or not. I would need a high speed camera for that. Even shooting a 9mm AR left handed, I have never had an issue with hot brass hitting me when using a standard size ejection port with or without a gas deflector installed. |
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Posted: 6/11/2022 10:49:37 PM EDT
[#8]
It’s a spikes tactical. Only one I have seen like it. It is made into the forging
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Posted: 6/12/2022 12:26:42 AM EDT
[#9]
Quote HistoryQuoted: Its not a shell deflector, by design shells never hit it, its a gas deflector. This … I have a 6450 removed clam shell…. Got a Colt 10.5” complete upper for a pistol build and did same. Love the old look and for me A Righty I’ve had Zero issues with debris of any kind H |
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Posted: 6/12/2022 11:49:19 AM EDT
[#10]
Front face of a plastic clamshell gas deflector that is now on a .22LR AR upper, but first spent about ten years on a 9mm AR upper.
 MHO, YMMV, etc. Be well. |
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Posted: 6/12/2022 5:01:53 PM EDT
[#11]
Quoted: I've noticed that on an upper designed specifically the AR9 the ejection port cover is shorter and as a result the shell deflector is ~3/4" more forward than on a 5.56.223 upper. Is having the case deflector 3/4" more forward that big of a deal on an AR9? Some have them, some don't, it's up to the guy who buys it what he wants....smooth, bump, door, whatever.  
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Posted: 6/12/2022 7:18:34 PM EDT
[#12]
Quote HistoryQuoted: Front face of a plastic clamshell gas deflector that is now on a .22LR AR upper, but first spent about ten years on a 9mm AR upper. https://i.imgur.com/AIpMSkW.jpg MHO, YMMV, etc. Be well. Looks like that got hit with a LOT more than gas! 
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Posted: 6/26/2022 9:47:39 AM EDT
[#13]
Quote HistoryQuoted: Looks like that got hit with a LOT more than gas! Mine has tons of 9mm case impact marks on it. More than the picture above. |
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Posted: 6/26/2022 10:03:06 AM EDT
[#14]
Quote HistoryQuoted: Mine has tons of 9mm case impact marks on it. More than the picture above. Well, good it's doing it's job. 
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Posted: 6/26/2022 11:53:00 AM EDT
[#15]
They are CHEAP - Less that $10
Colt Part # 62851 Never mind... Whole kit less than $12 at Buds |
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