Posted: 6/22/2012 10:52:12 AM EDT
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Some folks have reported they are having trouble with AAC mounts on the OBR due to the muzzle thread length (.750?) being longer than is internally accommodated by the muzzle device/mounts. I do not think this is a shortcoming of the OBR as I have seen claims of longer threads on AR-10/MWS platforms also.
I plan to mount a TBAC 30p-1 suppressor to my OBR. It is a thread-on can with a manufacturer's suggested thread length of .600" and I have concerns with exposing the barrel threads inside the can (manufacturer raised the concern of making suppressor removal difficult). It has been suggested that Larue offers a shim or spacer of some sort to remedy this situation. They are saying contact Alfred as he has the line on what is needed. Well, I called and Alfred is apparently no longer working there. Salesperson was not familiar with any such part. Anyone have any idea what part these folks are referring to? I'm sure it is a simple fix, but obviously with a suppressor you want something that maintains the standards of precision for proper alignment (especially for a rifle capable of the precision the OBR is). |
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I know what you're talking about. The Suppressor should have come with a "drawing/schematic" that shows the thread length measured from the shoulder.
There are spacers available, but a better option would be to have someone like ADCO (Industry Partner) cut the barrel to the Suppressor MFG Specs - its going to be a minor cut of material ... My 2 cents ... Or you could call the LT Shop and ask JP to chase this down for you. Someone will know about the spacer needed - Alfred wasn't the only one "in the know". |
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I talked to JP at Larue today and he was not familiar with it. I know Thunderbeast Arms specs .600" on thread length.
I agree turning it down is optimal, but for some reason there is something in me that does not want anyone else "messing" with the barrel. If I go that route, I'll talk to Mark Gordon of Short Action Customs in Wellington OH as he did a superb thread job on my TRG-22 for this same suppressor. ADCO does have a great rep as well. Thanks for the input. |
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I'd call Thunder Beast Arms as well on Monday.
A lot of Suppressor Manufacturers make "Spacers" for this very reason and don't necessarily list them in Catalogs or on their Websites. I ordered a .200 spacer (1/2x28) from Gemtech for my 15/22 AR since the threads on that Rifle are a long way from the shoulder - works like a champ. Let us know how it turns out and good luck! Edit - Looks like you already talked to TBAC and they directed you to talk to Alfred. Again, call the LT Shop back on Monday - if Alfred had them, then they're still there - JP needs to ask, or get Sheldon on it!!! 
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| There is a thread running on Sniper's Hide concerning this. Apparently a recent OBR recipient called LT today and was told a "spacer" would be sent to them. According to the post, LT had only one spacer available to send out. I would be most interested on having one as well with my rifle. I'll call Sheldon on Monday to see what he can dig up. This can't be that complicated! |
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My application for the OBR is in a precision rifle role exclusively. Been down that road before with a "quick-detach" can in that role. Generally speaking, a thread-on can is recommended (when the option exists - military may not have the luxury) for a precision rifle role. I came to the same conclusion after an experience with mount issues on suppressor from one of the major manufacturers (not Surefire - they are good to go). I also did more research this time and picked a can designed specifically for, and highly regarded for precision rifle applications. In my opinion, Snipers Hide is the best on-line resource for this particular subject.
http://www.snipershide.com/forum/ubbthreads.php?ubb=showflat&Number=2805008 I do have "quick-detach" on my SBR, so I am not averse to QD cans. Just optimizing for the intended role in this case. |
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those guys sell spacers for ar15 22lr.
Maybe they can make a custom one for you if larue does not have any. http://www.thesilencerstore.com/index.php?main_page=product_info&cPath=1&products_id=1 |
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Yes, the thread length on the OBR (and a few other guns like the Ruger scout rifle) are longer. I called both LT and AAC regarding this due to me having an AAC 762SD. LT originally told me they would include a stainless spacer to help accommodate the extra thread length, but it was overlooked when my order was completed. I called AAC and they provided me a spacer that works. I believe that LT will do the same, they are just a little busy and didn't get around to it. AAC said they now make deep socket flash hiders for the 51T system, but no brakes. So those of us with longer threads need a stainless steel spacer to use a brake.
For what it's worth, my 18T brake works well on my OBR, and the suppressor works very well! |
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had to use a spacer from AAC to mount my 51 tooth muzzle brake to my 762OBR recently....was GLAD my dealer had one when I went by to pick up the OBR or I would have been sitting and waiting for an answer without getting to play with my new toy!
hope all works out for you |
Just talked with Brent @ AAC this morning about my 7.62SD and he had 1, but needed it to make others, I guess you can't measure and write it down  . I was told it will be 2 weeks BEST case and we all know how that goes.
A least I have an old 3 prong QD I can shoot it with. NoHair |
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No worries on my end now. Communicated with the folks at Larue, and they took very good care of me.
I wanted their spacer as I knew the quality would be where it needs to be. Suffice it to say Larue's response was of the type that supports a reputation of having legendarily good customer service. I am very grateful for their efforts! |
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Quoted:
I have a 14.5" tOBR on order. in 5.56mm. I plan on mounting a AAC muzzle brake on it to use my M4-2000 suppressor. Will I need a spacer or is this just for the 762 OBR's? No.....my AAC 51 tooth muzzle brake went onto my 16" 556 OBR without a hitch. It appears to only be an issue on the 762 version, and only with certain thread on silencers and mounts from what I've read. |
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Quoted: Quoted: I have a 14.5" tOBR on order. in 5.56mm. I plan on mounting a AAC muzzle brake on it to use my M4-2000 suppressor. Will I need a spacer or is this just for the 762 OBR's? No.....my AAC 51 tooth muzzle brake went onto my 16" 556 OBR without a hitch. It appears to only be an issue on the 762 version, and only with certain thread on silencers and mounts from what I've read. Awesome. Thanks for the update. I have a 762 OBR on order too, but have a Surefire 762SS suppressor to run on it and ordered the OBR with a Surefire brake, but I wasn't sure with the AAC mount for 5.56mm. |
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Quoted:
Quoted:
I have a 14.5" tOBR on order. in 5.56mm. I plan on mounting a AAC muzzle brake on it to use my M4-2000 suppressor. Will I need a spacer or is this just for the 762 OBR's? No.....my AAC 51 tooth muzzle brake went onto my 16" 556 OBR without a hitch. It appears to only be an issue on the 762 version, and only with certain thread on silencers and mounts from what I've read. This, I have a 51tooth Brake on my 18" OBR-5.56, works FINE!!!!!!!!! |
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Quoted: I have a 14.5" tOBR on order. in 5.56mm. I plan on mounting a AAC muzzle brake on it to use my M4-2000 suppressor. Will I need a spacer or is this just for the 762 OBR's? I would contact LT and see if they can use your supplied Brake and P/W it so you don't have to send it out and have whatever LT P/Ws on cut off. Because whatever LT installs will have to be P/W to make 16"s on a 14.5" tOBR.  |
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All new AAC 51T 5/8x24 (.308) mounts now include the AR10 set back which the OBR shares. They are compatible with both AR-10 (OBR) and DPMS pattern threaded barrels. The flash hider mount has been available for some time, but the muzzle brake is coming available right now (07/24/2012). I know this from conversations with Mike Mers at AAC.
Hope that helps. |