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Posted: 9/10/2014 1:43:16 PM EDT
I have a 4.5 inch adco barrel under a knights armament 8.5 inch rail. My Octane 45 fits nicely under the rail......but is there a barrel extension I can purchase in the case I don't want to run the suppressor? It's a 9mm adco barrel.
something like this. This is a DPMS and when I called, I was told ID wouldn't allow for a 9mm bullet 
Thanks, |
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Posted: 9/10/2014 2:08:43 PM EDT
[#1]
If your barrel is threaded 1/2x28, yes that will work on a 9mm barrel. I bought one from Brownells ($13.11) for the same reason. It works just fine as is. No modifications required.
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Posted: 9/10/2014 2:11:50 PM EDT
[#2]
I use one of the 5.5 inch flash hider from model 1 sales for my 9mm. I am not sure if it's made by DPMS but it looks similar. YMMV
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Posted: 9/10/2014 2:52:22 PM EDT
[#3]
Quote HistoryQuoted:
I use one of the 5.5 inch flash hider from model 1 sales for my 9mm. I am not sure if it's made by DPMS but it looks similar. YMMV thanks, both of you. that's what I'm looking for. Just something to get the muzzle blast past the hand rail. |
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Posted: 9/10/2014 3:22:19 PM EDT
[#4]
Quote HistoryQuoted:
I use one of the 5.5 inch flash hider from model 1 sales for my 9mm. I am not sure if it's made by DPMS but it looks similar. YMMV ok, I called. Technician says internal diameter is 7/8 and he didn't recommend me using it on a 9mm barrel. Also called DPMS with the model number from Brownell's and they said internal diameter would only work for a 223. So, I'm back to square one. I supposed they are not made for this purpose but can be used? I'm not going to mess around with what if, so if I have to only use the rifle suppressed, I'm ok with that. |
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Posted: 9/10/2014 3:53:31 PM EDT
[#5]
send it to me and I'll open it up....just cover return shipping
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Posted: 9/10/2014 4:10:50 PM EDT
[#6]
Quote HistoryQuoted:
send it to me and I'll open it up....just cover return shipping Seriously, Thank you. I'll look into getting one. I appreciate that. I ordered one from Model 1. I'll let you know if I need assistance. It's in Texas, so I'll have it soon enough. |
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Posted: 9/10/2014 4:42:19 PM EDT
[#7]
I ordered that flash hider with the intention of having a machine shop drilling it out 3/8" to accommodate the 9mm bullet. It was not necessary. Where you normally have a constriction just past the wrench flats was more than large enough, almost 1/2" A 9mm bullet drops freely thru the entire length. Unless they are being cautious about the bullet not being stabilized for approx. 5" of barrel length. I've shot it, without issues, so far.
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Posted: 9/10/2014 8:56:43 PM EDT
[#9]
I just can't understand why they would say 9mm wouldn't work at DPMS. unless they are too lazy to go measure. If what I get is like what you have posted, then I'm good to go. I'll probably always shoot the octane, but never know
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Posted: 9/10/2014 9:56:38 PM EDT
[#10]
Quote HistoryQuoted:
I just can't understand why they would say 9mm wouldn't work at DPMS. They likely think your 9mm barrel has the 1/2-36 thread, and you cannot install a 1/2-28 threaded device on a 1/2-36 threaded barrel. I have never seen a 5.5" that was 22 caliber hole all way from mount to exit.. the thing would be rather heavy at that.. get your 5.5, and post back what it look like,, I will venture it back-bored all way to mount on the inside |
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Posted: 9/11/2014 11:11:17 AM EDT
[#11]
I have the DPMS 5.5" flash hider that I use for the same reason (4.5" barrel, 7.6" rail). You might still be a bit short with the 5.5" hider and an 8.5" rail, the slots on the hider wont all be outside of the rail, but it will be close (probably half under).
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Posted: 9/11/2014 11:22:06 AM EDT
[#12]
Quote HistoryQuoted:
I have the DPMS 5.5" flash hider that I use for the same reason (4.5" barrel, 7.6" rail). You might still be a bit short with the 5.5" hider and an 8.5" rail, the slots on the hider wont all be outside of the rail, but it will be close (probably half under). hmm, well I guess it's all they make for now. It will have to do. Hopefully I'm good. |
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Posted: 9/16/2014 11:08:12 PM EDT
[#13]
I got my 5.5 inch barrel extension in today. No modifications needed. The ID is far larger than the 9 mm bullet. Considering I'll be using this under a rail, how did you guys tighten it? Did you use a crush washer or anything on the threads? Not sure how you would get a crush washer on a 4.5 inch barrel. Would be tricky
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Posted: 9/17/2014 1:21:47 AM EDT
[#14]
I just thread mine on by hand and check for tightness as I would a can. Never have had it loosen up, though honestly I don't shoot without can very often...usually only if I need my shot timer to record my shots.
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Posted: 9/17/2014 10:09:20 AM EDT
[#15]
Just hand tightened and checked after each mag. Used it with a bumpfire stock and a couple hundred rounds last week, stayed tight.
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