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Posted: 10/19/2004 5:21:13 PM EDT
My latest lathe project. I took a 20" AR barrel, shortened it to 18" and gave it an SPR profile. The barrel has been re-threaded 1/2-28. I also fabricated an SPR type collar to give it that OPS INC. look. The barrel and collar have been bead blasted. Now to park it all, assemble, and test fire. What do ya think ??? Thought about adding some flutes.
ARguy 
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Posted: 10/19/2004 5:54:14 PM EDT
[#1]
Nice job. Flutes would be nice - different.
 Here's a modified Vortex G6 made into an Ops Inc style FH setup that would look real nice on your barrel  . Once I get my lathe running, I'll likely be doing the same type of project that you did: |
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Posted: 10/19/2004 5:55:15 PM EDT
[#2]
I think you could make a few bucks by having people send you their 20" for this treatment.
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Posted: 10/20/2004 9:48:11 AM EDT
[#3]
Not sure if Im up to working on other people's barrels, but I can make up some more of the collars if people want a low cost SPR look.
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Posted: 10/20/2004 11:47:29 AM EDT
[#5]
How much for one of the collars, and how does it attach?
These probalby won't work with a 16" barrel will it? |
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Posted: 10/20/2004 3:53:35 PM EDT
[#6]
ARGuy, I am not trying to steal any business of yours, just showing that the collars do fit on 16" barrels with this pic: 
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Posted: 10/20/2004 4:07:01 PM EDT
[#7]
O2BNMUD-
The one I made just uses a set screw on the bottom. I might get gigged b/c this is not the appropriate forum but do you think $30 is fair ?? I'll make up a few, park em, and place an ad on the EE board if anyone wants one. |
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Posted: 10/20/2004 8:12:15 PM EDT
[#8]
Trying to figure out what the deal is with the EXTERNAL threads on your flashhider. How does it attach and what does it offer over a phantom?
Not up to speed on the highspeed stuff myself. |
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Posted: 10/20/2004 9:41:23 PM EDT
[#9]
External threads mate with the INTERNAL threads on an OPS Inc suppressor
 The flash hider just screws on the barrel in a normal fashion. What the vortex offers over the phantom is better flash suppression. |
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Posted: 10/21/2004 8:50:18 AM EDT
[#10]
ARguy -
Who makes the Gas Block on the SPR barrel you made in this picture? I have been looking for one just like that to go on my 7.5" AR Pistol barrel with a .750" dia. Any help you could provide would be greatly appreciated, MadDog 
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Posted: 10/21/2004 8:58:26 AM EDT
[#11]
What is the point of the collar?
Jerad |
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Posted: 10/21/2004 9:05:26 AM EDT
[#12]
What kind of lathe did you use?
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Posted: 10/21/2004 9:09:11 AM EDT
[#13]
Did you open up the gas port?
I wonder how much the reduction in dwell time will affect things. |
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Posted: 10/21/2004 9:17:49 AM EDT
[#14]
no effect |
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Posted: 10/21/2004 10:16:59 AM EDT
[#15]
MadDog- Sent you an IM regarding the gas block.
Jerad- My understanding is that the OPS INC. Suppressor butts up to the collar and provides a second point of contact for attachment. I may be wrong and Im sure someone with more knowledge on the OPS INC. can will chime in. All my cans are Gemtech. The collar I made and put on the barrel serves no practical purpose at all. Just gives it that SPRish look. Vector Joe- I have a Grizzly lathe.....which is fine for a hobby machinist like myself. Innocent Bystander- No, I didnt open up the gas port any. Gonna wait and see if it needs it first. |
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Posted: 10/21/2004 10:39:09 AM EDT
[#16]
Is it anything like this? www.harborfreight.com/cpi/ctaf/Displayitem.taf?itemnumber=45276  If so, what kind of tools did you use to do the contouring, cutting and threading? Thanks |
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Posted: 10/21/2004 10:41:26 AM EDT
[#17]
That's a wood lathe. |
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Posted: 10/21/2004 10:53:11 AM EDT
[#18]
No, its more like this:
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Posted: 10/21/2004 6:32:37 PM EDT
[#19]
I sent you an im about buying one. Make mine in-the-white. I forgot to say that in the im.
Thanks and looks like great work. |
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Posted: 10/23/2004 4:17:05 PM EDT
[#20]
Here is another pic after the collar has been parked. Im still debating on fluting the barrel so I didnt park it yet. Also in the pic are some extra collars I made up for the EE.
ARguy Mark 
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Posted: 10/27/2004 12:53:04 PM EDT
[#21]
ARguy if you dont mind can you detail how you cut the barrel? I have the same project going and just wanted to see how you finished it up. Thanks
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Posted: 10/27/2004 4:48:47 PM EDT
[#22]
the only trouble with useing a 20" barrel is that the collar sets back to close to the gas block if your turning your own barrels you have to make the .750 (where your gas port is ) a total of about 2 inches long then your collar goes on then your break opps is not selling there threaded break yet
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Posted: 10/27/2004 4:54:27 PM EDT
[#23]
I guess I need a gunrunner to English translator, cause I can't make out anything you are saying. I have an SPR profile barrel and I made custom Ops Inc type parts and still can't put your comments together. 
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Posted: 10/28/2004 4:20:18 AM EDT
[#24]
Flashooter-
I started with a 20" barrel. I cut it down to 18", re-crowned the muzzle, and threaded it 1/2-28. The .750 (going off memory) diameter under the gas block was not changed. I'll have to check on the diameter of the rest of the barrel. I turned it down to that of a real SPR, but Im at work right now and can't think of it. I then glass bead blasted the whole thing. I think Im gonna ad some flutes when I get around to it. If you want any other specifics, just let me know. Mark Arguy |
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Posted: 10/28/2004 4:33:32 AM EDT
[#25]
Mongo-
I think what Gunrunner is referring to is the placement of the gas block in relation to the muzzle. I believe that a true SPR uses a mid length gas system which would place it farther back on the barrel. Since I just cut down a 20" barrel, it is set up with the original rifle length gas system. Since I dont plan on using an OPS INC. suppressor, its not an issue for me. My understanding is that the OPS INC. cans are currently not available outside the military right now. |
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Posted: 10/28/2004 7:32:14 AM EDT
[#26]
Correct me if I'm wrong, but I think the real SPR uses a rifle length gas system. The reason you see a gap between the gas block and the collar is, in my opinion, that the gas block is not long enough. If you look at some of the SPR pictures on this site, you will notice that the KAC gas block on a Mk 12 Mod 1 is quite short and leaves a gap between the collar and the gasblock. However, the PRI flip-up front sight on the Mod 0 is rather long and comes into contact with the collar.
Here's a photo from ADCO's for sale threads, that's a Mod 0 style setup. You can see that the gas block comes into contact with the collar. photos.ar15.com/WS_Content/ImageGallery/Attachments/DownloadAttach.asp?sAccountUnq=24424&iGalleryUnq=1063&iImageUnq=22763 Here's another from ADCO showing a Mod 1 setup. Notice how the gas block is quite short. www.besthdw.com/test/joe2.JPG |
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Posted: 10/28/2004 7:41:28 AM EDT
[#27]
SPRs use rifle lenght gas systems. Mod0 has the PRI, Mod1 has the KAC low profile gas block.
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Posted: 10/28/2004 8:02:18 AM EDT
[#28]
Oh, ok. Thanks for the info. Now Im not sure what Gunrunner was referring to.
Mark ARguy |
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Posted: 1/29/2005 11:09:22 AM EDT
[#29]
Well, I finally got time to work on this barrel some more. I decided to flute it for grins. The barrel has been finished in Tan Norrel Molycoat. The flash suppressor, gas block, collar and flutes are in OD Green Molycoat. Thought it came out pretty good. Whatcha think ???
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Posted: 1/29/2005 11:13:01 AM EDT
[#30]
Another Photo
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Posted: 1/29/2005 1:01:32 PM EDT
[#31]
thats is beautiful !!!!...very neat
now..when is the group buy ?  I want one !!!!
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Posted: 1/29/2005 6:19:22 PM EDT
[#32]
the collar is so that when the suppressor is installed, it is perfectly aligned with the bore. while you tighten the suppressor, the rear end of it pushes up against the collar and the taper of the collar snugs up the suppressor, keeping it centered perfectly in line with te bore.
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Posted: 2/14/2005 12:04:33 PM EDT
[#33]
Pics of the complete upper are coming.............stay tuned.
ARguy |
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Posted: 2/16/2005 6:28:31 AM EDT
[#34]
Tag.
now, how about somebody making a SPRish tube thats NOT $300? 
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Posted: 2/25/2005 1:35:51 PM EDT
[#35]
An SPRish Brake to go with my SPRish collar....
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Posted: 2/25/2005 1:37:59 PM EDT
[#36]
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Posted: 2/25/2005 2:59:24 PM EDT
[#37]
subscribing for when you will offer a package :)
by the way, can you make it functionnal ? like the real Ops Inc ? |
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Posted: 2/26/2005 6:37:35 PM EDT
[#38]
Exocet-
I could make it functinal. Im not sure what the thread size is for the OPS INC can but it shouldnt be too hard to find out. My .223 can is a Gemtech M4-96D so for me, this is all just for looks. I believe AAC is getting ready to release the M4-2000 in 6.8 Rem SPC. Thats the way I will probably go building a 6.8 upper. ARguy Mark |
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Posted: 2/28/2005 8:04:11 PM EDT
[#39]
tag
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Posted: 3/16/2005 2:41:34 PM EDT
[#40]
Brake after its been parked....
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Posted: 3/16/2005 3:45:22 PM EDT
[#41]
good evening.
FNG here. sorry about that. does anyone know where i could find the dimensions of a flash hider? i have the mill and the lathe. i would think that i would be able to make one. also, arguy; what size of end mill did you use to do your fluting? depth of cut? is there a formula for these things? like maybe depth allowable for what size barrels? i have been thinking about a heavy barrel varmint gun. flutes would be cool. thanks. peace. bill edited to correct my poor typing and poor memory for names. |
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Posted: 3/16/2005 3:51:58 PM EDT
[#42]
i'd ask steve at ADCO. i just got a DMM4 upper from him and it's 0.9" with flutes. SS by the way...
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Posted: 3/16/2005 4:06:43 PM EDT
[#43]
How effective is the SPR type brake? Was it basically designed with the suppressor in mind from the beginning or does it work well as a stand alone unit?
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Posted: 3/17/2005 7:41:28 AM EDT
[#44]
Bill- Ill have to get back with you on the endmill size, Im at work right now and dont remember off the top of my head. I was conservative with the depth. Mark |
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Posted: 3/30/2005 12:19:40 PM EDT
[#45]
So how's it shoot?
Rich |
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