Posted: 8/23/2015 8:07:38 PM EDT
| I just received my new AAC 7.62sd paired with the 51t blackout mount. This is my first large can and I have never used the 51t system before. When I go the thread it on I reverse it until I hear the threads line up then I begin to thread it on. The problem it I have to play with it rotate it back and forth before it will thread on. Not sure whats going on I felt around the mount and inside the can for a bad spot or a burr but didn't find anything. Anyone hand anything like this before ? |
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Who made the barrel.....you'd be amazed at the number of people out there making barrels who use a flash suppressor or the like to gauge threads.......sounds like you have a barrel that the threads are oversize, or the adapter is undersize..(unlikely with AAC)......if you want to cover shipping...send me the barrel and I will check it with my thread gauges.......
I'm assuming you haven't been able to get it to thread on completely yet. Edit....Damn, I'm in Macon, just saw you be in GA  ......forgot I was in the HTF........if you can swing by the shop I'll be happy to let you use the thread gauges yourself......and if necessary....I can be persuaded to set the barrel up in the lathe and pick up the thread and recut.....as it is a pain and I hate doing it....It'll cost ya a bottle of Bushmills Black label.......liquor store across the street has it.......
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I think he means the suppressor won't screw onto the mount, not that the mount won't screw onto the barrel. I could be mistaken, but that was the way I read into it. Ding Ding Ding... the Suppressor and the mount wont mate correctly every time. I have to play with it twisting to can back and forth and then it threads right on. 
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Ding Ding Ding... the Suppressor and the mount wont mate correctly every time. I have to play with it twisting to can back and forth and then it threads right on. http://media.midwayusa.com/productimages/880x660/Primary/284/284904.jpg Quoted:
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I think he means the suppressor won't screw onto the mount, not that the mount won't screw onto the barrel. I could be mistaken, but that was the way I read into it. Ding Ding Ding... the Suppressor and the mount wont mate correctly every time. I have to play with it twisting to can back and forth and then it threads right on. http://media.midwayusa.com/productimages/880x660/Primary/284/284904.jpg OK I see what you are saying. I have not heard of that problem. Call aac and talk to them. I would want to send them the can and mount to check out. |
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Quoted: OK I see what you are saying. I have not heard of that problem. Call aac and talk to them. I would want to send them the can and mount to check out. Quoted: Quoted: Quoted: I think he means the suppressor won't screw onto the mount, not that the mount won't screw onto the barrel. I could be mistaken, but that was the way I read into it. Ding Ding Ding... the Suppressor and the mount wont mate correctly every time. I have to play with it twisting to can back and forth and then it threads right on. http://media.midwayusa.com/productimages/880x660/Primary/284/284904.jpg OK I see what you are saying. I have not heard of that problem. Call aac and talk to them. I would want to send them the can and mount to check out. |
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I have used a few new ones and never noticed what you are describing. It is a very course thread. It will not be damaged if you force it on a couple of times. That may clear it up.
At this point, I understand that you do not know which piece is binding or you could just have tolerance stacking that is causing a tight fit. I personally like a tight fit. I would try the can on another mount and try another can on your mount and see if you have the same problem. I do not see how the rachet system could be binding it, but I would hold it in release mode and twist back and forth to feel where the bind is at. My last resort would be to get something to coat the mount, then assemble, you can see where the pressure contact occurs because the coating will be scraped off. |
| I had a similar issue with an AAC brake that I used a screwdriver through the brake to tighten. It deformed the side of the brake just enough to that the can wouldn't fully seat. I had to sand the brake where it was deformed to get the can to seat fully. How did you tighten the mount? |
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I had a similar issue with an AAC brake that I used a screwdriver through the brake to tighten. It deformed the side of the brake just enough to that the can wouldn't fully seat. I had to sand the brake where it was deformed to get the can to seat fully. How did you tighten the mount? AAC has a tool for tightening mounts that fits inside all 3 prongs uniformly. Also works good on other pronged flash hiders like Silencerco Specwar and Saker. |
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AAC has a tool for tightening mounts that fits inside all 3 prongs uniformly. Also works good on other pronged flash hiders like Silencerco Specwar and Saker. Quoted:
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I had a similar issue with an AAC brake that I used a screwdriver through the brake to tighten. It deformed the side of the brake just enough to that the can wouldn't fully seat. I had to sand the brake where it was deformed to get the can to seat fully. How did you tighten the mount? AAC has a tool for tightening mounts that fits inside all 3 prongs uniformly. Also works good on other pronged flash hiders like Silencerco Specwar and Saker. How's it work on brakes 
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I had a similar issue with an AAC brake that I used a screwdriver through the brake to tighten. It deformed the side of the brake just enough to that the can wouldn't fully seat. I had to sand the brake where it was deformed to get the can to seat fully. How did you tighten the mount? Used a wrench on the bottom. It's not very tight either I doesn't have to be timed and since I only have one I am using it on my 308 too. |
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Who knows... I used a crush washer and snuged it up. Quoted:
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Rounded flats? How hard are folks cranking down on these things?!?! Who knows... I used a crush washer and snuged it up. YOU WHAT? No crush washers on silencer mounts. Never ever ever ever. Ever. I seriously hope that you're messing around. Manual specifically calling out no use of any kind of washer. You're inviting a baffle strike. Take it off. For real. |
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They don't have flats? The pic above has flats. Quoted:
They don't have flats? The pic above has flats. Bruce, Yes Sir they all have flats. The 7.62 brakes have flats at the back for an adjustable or 7/8" wrench. 5.56 brakes are still the old school style that actually have "3/4 Wrench" engraved on the flattened from of the mount. The above only include 51T brakes. If we are speaking about flash hiders (Blackouts) or compensators (Brake-outs) then while those all have flats as well there is a rather ingenious flash hider installation tool that will fit into the prongs of those devices and the user will have a more accurate torque reading as it is in line with the bore of the barrel. The use of a crows foot and a torque wrench does not always provide the most accurate reading when installing a mount. Apparently some can't follow simple instructions and the torque specs that are on the packaging. Thsoe torque specs (from the packaging) call out: 1/2-28: 20-30 FT-LBS 5/8-24: 45-55 FT-LBS 3/24-24: 90-100 FT-LBS It's simple. Read the instructions. Use the correct tools (A screwdriver is not a wrench). Follow the instructions. Enjoy. Wash. Rinse. Repeat. Quoted:
Some of them have been torqued down pretty good and with the addition of the Rockset, well, getting them off with that adjustable spanner wrench........... Absolutely correct. soaking the rocksett overnight in water is supposed to break it down. On AAC Factory uppers there were instances of an excess of rocksett being used so sometimes that doesn't always do the trick. |
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YOU WHAT? No crush washers on silencer mounts. Never ever ever ever. Ever. I seriously hope that you're messing around. Manual specifically calling out no use of any kind of washer. You're inviting a baffle strike. Take it off. For real. Quoted:
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Rounded flats? How hard are folks cranking down on these things?!?! Who knows... I used a crush washer and snuged it up. YOU WHAT? No crush washers on silencer mounts. Never ever ever ever. Ever. I seriously hope that you're messing around. Manual specifically calling out no use of any kind of washer. You're inviting a baffle strike. Take it off. For real. Thanks I didn't know that... i didn't see any paper work in the box but i didn't pull all the foam out to see it so. Thanks for saving my investment. Just removed it thanks. |
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How's it work on brakes
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I had a similar issue with an AAC brake that I used a screwdriver through the brake to tighten. It deformed the side of the brake just enough to that the can wouldn't fully seat. I had to sand the brake where it was deformed to get the can to seat fully. How did you tighten the mount? AAC has a tool for tightening mounts that fits inside all 3 prongs uniformly. Also works good on other pronged flash hiders like Silencerco Specwar and Saker. How's it work on brakes
DOH! Next time I'll read for comprehension. Sorry! Back to lurking. |