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Posted: 1/6/2010 3:05:21 PM EDT
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I purchased a Wilson upper and a BCM 16" mid-length barrel. The barrel will only go a couple of millimeters into the upper before becoming very tight. This is my first build and I am unsure how much pressure to apply or if I should "tap" it into place.
Thanks in advance |
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Good advice, being take down the outer surface of the barrel extension a thousands or two of an inch the snuggly fit the barrel socket, verses removing the anodizing coating inside the upper barrel socket to match the steel barrel receiver.
If you are going to lathe the work, pull the barrel extension index pin first, then reinstall it afterwards. If not with a lathe, then you may be able to do such by hand as well. |
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I purchased a Wilson upper and a BCM 16" mid-length barrel. The barrel will only go a couple of millimeters into the upper before becoming very tight. This is my first build and I am unsure how much pressure to apply or if I should "tap" it into place. Thanks in advance DON'T tap it into place. Try to find out why you are having a problem. If you need to adjust any of the dimension's. Adjust the least expensive part. 458 |
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Ok, so from what I gather these should fit snugly and no force should be necessary to get the barrel extension into the receiver. Yes, you should not to mallet it in, but on the same token if you have Moly greased the parts per install direction, you might find that you can press it in hard by hand. |
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It depends on how snug it is...
I have assembled some that were snug to the point that a light tap was required to seat the barrel into the upper. No problems... If it is so tight that it won't even start to go in or requires a solid whack to go in, you might have an issue. If it were me, I would lube all the contact surfaces with a light grease and see if I could slide the barrel into the upper with a few light taps from a rubber mallet being sure not to damage the muzzle or drive anything in too hard. If that fails, I would send the upper back and get a LaRue. They seem to be very dimensionally correct in my limited experience. |
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I purchased a Wilson upper and a BCM 16" mid-length barrel. The barrel will only go a couple of millimeters into the upper before becoming very tight. This is my first build and I am unsure how much pressure to apply or if I should "tap" it into place. Thanks in advance What does the barrel extension measure ? I would clean both mating surfaces very well & lube with molley grease . Then carefully try again . I suspect this is much better than loose ? And probably not difficult to correct . God bless Wyr |
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Really, not a uncommon problem when installing a barrel and would rather have a tighter fit than looser in the end.
Really, sounds like only a few thousands of an inch reduction is needed on the OD of the barrel extension, and that can be achieved on the barrel extension in a mater of mins by just hand round sanding the outer surface of such (read would not even need to pull the barrel extension pin for such). |
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I've had the same situation a couple of times. A few light taps with a rubber mallet worked. Oh, btw when I later removed the barrel after a few hundred rounds, it slid out easily. So possibly thickness of the anodizing. Best I remember , the barrel extension is left in the white ( not parked ) ? All this just goes to point out that an AR is a high tolerance machine . Compared to , say , an AK . Which has its advantages and disacvantages . God bless Wyr |
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I've had the same situation a couple of times. A few light taps with a rubber mallet worked. Oh, btw when I later removed the barrel after a few hundred rounds, it slid out easily. So possibly thickness of the anodizing. Best I remember , the barrel extension is left in the white ( not parked ) ? All this just goes to point out that an AR is a high tolerance machine . Compared to , say , an AK . Which has its advantages and disacvantages . God bless Wyr The upper receivers are anodized. |
Spread some clp or other lubricant and it should go in fine. Mine was the same way and i lubed the outside of the barrel extension and the inside of the upper barrel insert point. After a little pushig it will go right in, i had to slighly twist it side to side until it seated. If this doesnt work, im sur ADCO will know what to do.
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Thanks for the input guys. I put some CLP on both parts and with a little push it went right in. Problem now is the Pin didn't hit the slot, it is off by hair and I can't twist it in place or get the two apart by hand. I guess I will have to get it in a vice and try to pull them apart or use a strap wrench and try to twist barrel over a little bit. This AR building isn't as easy as Brownell's makes it look.
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| Youll get it out with a little more fiidling, once you get it out lube it up again and repeat it gets easier everytime you push it in or pull it out. Just pull or have a buddy held, I dont know about the vise( unless you have receiver blocks). Youll get it. it took me about 30 min fiddlin with it to make it snug but still able to pull out . |
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Go to Lowe's or Home Depot. Buy a pipe wrench and a crescent hammer and hit yourself in the head with them until you figure it out.
Or go buy a manual and have it read to you. I've never read any reference, in any Manual suggesting reducing the dia. of the extension or increasing the dia. of the receiver Except in this thread. Thousands have been built without this being done. 458 |
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Thanks for the input guys. I put some CLP on both parts and with a little push it went right in. Problem now is the Pin didn't hit the slot, it is off by hair and I can't twist it in place or get the two apart by hand. I guess I will have to get it in a vice and try to pull them apart or use a strap wrench and try to twist barrel over a little bit. This AR building isn't as easy as Brownell's makes it look.
You shouldn't need a vice...just wiggle the barrel and upper while you twist. It should pop in the slot. Sometimes it takes a little tap to get it in the slot. |
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Go to Lowe's or Home Depot. Buy a pipe wrench and a crescent hammer and hit yourself in the head with them until you figure it out. Or go buy a manual and have it read to you. I've never read any reference, in any Manual suggesting reducing the dia. of the extension or increasing the dia. of the receiver Except in this thread. Thousands have been built without this being done. 458 Hey thanks for the absolutely useless information. go some where else and spout off about how your an idiot. |
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Go to Lowe's or Home Depot. Buy a pipe wrench and a crescent hammer and hit yourself in the head with them until you figure it out. Or go buy a manual and have it read to you. I've never read any reference, in any Manual suggesting reducing the dia. of the extension or increasing the dia. of the receiver Except in this thread. Thousands have been built without this being done. 458 Hey thanks for the absolutely useless information. go some where else and spout off about how your an idiot. I'm not the one trying to put together an upper. And having problems. You are. You should have the correct tools, lubes and information at hand to do so. 458 |
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Enough of the Banter that will lead no where good!!!!!!!
It's not total uncommon for OD of the receiver extension to be a thousands or so large, and the same for the upper barrel socket being a few thousands small as well in the civilian market. In manuals, you are dealing with Mil spec parts that have been inspected no less than three times before an armor even lay his hands on such. But in the the civilian world with parts made by just about everyone, and no one inspecting such to confirm that they are withing mil spec, tolerances can be slightly off, hence parts made to fit during install. Trust me, when it happens at one of the shops or dealers that are assembling such, the parts are mated/fitted and installed, verses sending such back at a loss (shipping costs). Back on the barrel now being wedged. To remove such, use a long wooden dowel (just smaller than the barrel extension) through the back of the receiver, and pop the barrel back out of the receiver barrel socket. The wood will distort long before the metal, and it should not take much force to move the barrel back out. Now this time, if fitting the parts is not an option (reducing the OD of the barrel extension so it fits the upper receiver barrel socket correctly so it does not need to hammered into place), then either send the parts back to be check, or find a smith to install the barrel. Pounding away at the barrel with a hammer to set it in the socket is going to end badly, and although snug is good, ram forced will end up with the upper receiver socket either bent or cracked. |
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I'm gonna make a suggestion but first I must say I have never installed a barrel to a receiver......
If I had a problem with a barrel that was slightly too snug/tight before I would "tap" the barrel into place I would try putting the barel in the freezer and/or the receiver in the oven. |
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If you run hot water on the receiver, it will probably open up enough for the barrel to go in. Noob Yes. I agree. Don't put too much heat on the aluminum. A couple hundred degrees (boiling water) won't hurt it and only needed on the threads/barrel socket. |
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