StainTrain Posted August 10, 2015 Report Posted August 10, 2015 I finished up all the shooting on the MBT-2S today. While I was in the process of cleaning my weapons, I decided to add a Troy Alpha to one of the rifles. I removed the FH, FSB, and loosed the barrel nut. Noting seemed out of place and the barrel nut came off with the normal amount of effort. Once the barrel nut was off, I noticed the barrel was free spinning. The index pin was broken and on the floor. The upper wasn't damaged in any way. So what are my options. The barrel is a PSA lighter profile 1/7 that I picked up on sale a couple years ago. The round count isn't too high, but I have ran it hard. So what are my options? Can it be repaired? Will it cost more to fix than a new one? I did a little google fu and see where some guys have done it themselves. Have any of you guys done it? Again, if it will cost over $90 bucks to repair, I will start shopping Ballistic Advantage or Faxon for a new barrel.
MikedaddyH Posted August 10, 2015 Report Posted August 10, 2015 Is the pin broken and wedged in the barrel or is the hole open. Hard fix or easy fix ? But very fixable ! May have to drill out indexing pin ,or make a custom pin . Pictures please.
StainTrain Posted August 10, 2015 Author Report Posted August 10, 2015 The pin is broken. I thought those pins were supposed to be pretty tough
98Z5V Posted August 10, 2015 Report Posted August 10, 2015 (edited) Not a big deal, if you can get the other piece out. Alot of people think the barrel index pin locks the extension onto the barrel, but it doesn't. If the old chunk will come out, you have no issues, brother. http://www.jsesurplus.com/ar15barrelextensionpinpinonly.aspx Yank that fucker out with a wicked magnet... :hethan: Edited August 10, 2015 by 98Z5V
Rsquared Posted August 10, 2015 Report Posted August 10, 2015 Replace the barrel (you're screwed). For the piece of mind. Unless you want to experiment..........................................
Toolndie7 Posted August 10, 2015 Report Posted August 10, 2015 Definately fixable. Biggest bitch would be indexing the barrel to 90* to drill out the old pin. I would call up a local machine shop. Doesnt have to be a gunsmith job by any means.
DNP Posted August 10, 2015 Report Posted August 10, 2015 I have some glue.....if you you're concerned about drilling.
Toolndie7 Posted August 10, 2015 Report Posted August 10, 2015 I have some glue.....if you you're concerned about drilling. <lmao>
StainTrain Posted August 10, 2015 Author Report Posted August 10, 2015 (edited) Couldn't get the remaining piece out. Heat, drill press, magic... It's in there. ADCO charges $35 bucks to repair plus both ways shipping. It almost met my new barrel purchase threshold. I will sleep on it. The choice would be a helluva lot easier if everyone didn't seem to have barrel deals. Edited August 10, 2015 by StainTrain
98Z5V Posted August 11, 2015 Report Posted August 11, 2015 You try the fuckin' wicked magnet yet, brother? Rip out one of the big 12" speakers in the sub box on your GOV, and use IT for the magnet... I'm just sayin'... <lmao> If the barrel is a shooter, save it. Even if you have to send it to ADCO, and pay. I still like the GOV sub box idea, though... You know you can get the sub box replaced, with some loquacious written reports... <laughs> <thumbsup>
Toolndie7 Posted August 11, 2015 Report Posted August 11, 2015 (edited) this method has never failed me yet. BUT, you would have to set up a fairly small drill in a press and thats assuming the pin is only case hardened. Of course yo dont have to get as fancy as thie pic shows but you get the idea. I ususally just drill though the broken pin and drip some thick way oil in there and just use a sharp blow on the center pin. You could use the ass end of the drill you used to put the hole in as a "pin" Edited August 11, 2015 by Toolndie7
survivalshop Posted August 11, 2015 Report Posted August 11, 2015 Those Alignment Pins are usually a light press fit & the fix above is probably what ADCo will use . They may also have an alignment jig set up to re-drill the old broken pin out & make a custom fit one . I certainly would not operate an AR type rifle with out that alignment pin , There is no way I would trust just the Barrel nut to keep the Barrel from rotating . Even a slight rotation , would keep the Bolt from locking or cause damage to those components . Kinda makes one wonder why it broke ? I think the Glue method is promising <lmao>
mrraley Posted August 11, 2015 Report Posted August 11, 2015 your barrel is scrap... send it to me for proper disposal.
mrmackc Posted August 11, 2015 Report Posted August 11, 2015 Drilling a hole thru the center of the pin then using chassis grease to fill the hole and then using a drill rod the same size as the center hole set over the grease and hitting a swift blow with a hammer to hydraulically remove the pin, the grease displaces the bottom of the pin and out it comes. However I would plan to either use an ease-out or tap the hole with a 10-32 machine screw tap, then screw a machine screw with an allen head cap and screw it out ot pry it out. It may be that when you start drilling the center hole the pin will be spun out by the drill bit. My big question is why did the pin shear off in the first place!
StainTrain Posted August 12, 2015 Author Report Posted August 12, 2015 You try the fuckin' wicked magnet yet, brother? Rip out one of the big 12" speakers in the sub box on your GOV, and use IT for the magnet... I'm just sayin'... <lmao> If the barrel is a shooter, save it. Even if you have to send it to ADCO, and pay. I still like the GOV sub box idea, though... You know you can get the sub box replaced, with some loquacious written reports... <laughs> <thumbsup> I deployed the magnet (sans the "brick time" method described above") the barrel just stuck to it. I sent it to ADCO today. After screwing around with the barrel yesterday, I determined that $35 is more that fair.
StainTrain Posted August 12, 2015 Author Report Posted August 12, 2015 My big question is why did the pin shear off in the first place! I wish I could answer that. According to my records, it was torqued to 45 ft lbs. I treated the barrel harshly recently during my little experiment, but I can't see that as the cause of it. This is the first time this has happened through numerous builds, reconfigurations, and swaps.
mrraley Posted August 12, 2015 Report Posted August 12, 2015 Believe it or not... the index pin is just set in the hole of the barrel extension. Once it's in the hole, some places put a drop of loc tite on it and tap it into place to let it set. But there are no threads on the index pin itself.
survivalshop Posted August 12, 2015 Report Posted August 12, 2015 Maybe just a weak pin & torquing the Barrel nut snapped it <dontknow> Strange , for sure , I've never seen one broken . I have seen them come out , but not broken .
MikedaddyH Posted August 12, 2015 Report Posted August 12, 2015 I have seen them bent and just pulled the pin out with vise grips , only had to tap a new pin in. Pretty easy fix,never had to drill one out.
FaxonNathan Posted August 13, 2015 Report Posted August 13, 2015 I finished up all the shooting on the MBT-2S today. While I was in the process of cleaning my weapons, I decided to add a Troy Alpha to one of the rifles. I removed the FH, FSB, and loosed the barrel nut. Noting seemed out of place and the barrel nut came off with the normal amount of effort. Once the barrel nut was off, I noticed the barrel was free spinning. The index pin was broken and on the floor. The upper wasn't damaged in any way. So what are my options. The barrel is a PSA lighter profile 1/7 that I picked up on sale a couple years ago. The round count isn't too high, but I have ran it hard. So what are my options? Can it be repaired? Will it cost more to fix than a new one? I did a little google fu and see where some guys have done it themselves. Have any of you guys done it? Again, if it will cost over $90 bucks to repair, I will start shopping Ballistic Advantage or Faxon for a new barrel. We're honored to be thought of. While we have a conflict of interest, as a shop, we pitch barrels if a pin breaks. We do not recommend replacing one.
StainTrain Posted August 13, 2015 Author Report Posted August 13, 2015 We're honored to be thought of. While we have a conflict of interest, as a shop, we pitch barrels if a pin breaks. We do not recommend replacing one. Now you tell me. I was real close to picking up one of your pencil barrels. Maybe Adco can't fix it.
FaxonNathan Posted August 13, 2015 Report Posted August 13, 2015 Now you tell me. I was real close to picking up one of your pencil barrels. Maybe Adco can't fix it. Sorry! Need to visit forums more often.
survivalshop Posted August 13, 2015 Report Posted August 13, 2015 Now you tell me. I was real close to picking up one of your pencil barrels. Maybe Adco can't fix it. You can still get the Pencil barrel , whats the problem <dontknow> <lmao>
Malig8r Posted August 13, 2015 Report Posted August 13, 2015 You can still get the Pencil barrel , whats the problem <dontknow> <lmao> I'm with SS...I think you neeeeeeed an extra barrel in case of a similar problem in the future...
StainTrain Posted August 14, 2015 Author Report Posted August 14, 2015 What a wretched crew of shameless enablers
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