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Posted: 2/15/2013 4:17:33 PM EDT
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NT Defense billet lower and LPK from PSA.
No issues until I put the buffer retainer on top of the buffer spring, screwed the buffer tube in to catch and hold down the retainer. When I went to put the buffer in the tube the retainer was pushed down and was stuck. It was lubed before it went in. I've tried needle nose, rubber mallet, oil, and all I've ended up doing is pushing it down more. Any ideas? 
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rather than heating it with a propane torch, take the lower and set it in the freezer for about 20-30 minutes. then try using just a simple lighter flame on it. it worked for me for some stubborn buffer tubes (not the pins though). may be worth a try, before using a full on torch.
I'm not sure, but the propane torch could be too much heat. |
| I have it in the freezer now I'm willing to try anything at this point. I have a feeling I will be drilling it out. I'm not sure how it could be a wrong spring, every other spring is where it should be and I matched everything up to the build diagram before I started. |
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Quoted:
NT Defense billet lower and LPK from PSA. No issues until I put the buffer retainer on top of the buffer spring, screwed the buffer tube in to catch and hold down the retainer. When I went to put the buffer in the tube the retainer was pushed down and was stuck. It was lubed before it went in. I've tried needle nose, rubber mallet, oil, and all I've ended up doing is pushing it down more. Any ideas? http://i.imgur.com/ht2LhHh.jpg Instead of a naked, conventional needle nose, try a 90 degree offset needle nose with each point shoved into two separate fingers of a latex (or nitrile) glove. The offset will give you a better approach angle and the latex glove will add traction. The rubber mallet may be useful if you hold the receiver with the pin facing down and then strike the area over the takedown pin. |
| I'm assembling my north tech right now and just checked my buffer retainer to be sure (using a bushmaster lpk) and it fits fine. Is your north tech super tight to fit to the upper? I mean I have to muscle this thing closed. Also I can't get the rear take down pin in?? I'm using a aero precision upper I wouldn't think the aero precision upper is out of spec. I put my dpms upper on and it fit fine. |
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Quoted:
I'm assembling my north tech right now and just checked my buffer retainer to be sure (using a bushmaster lpk) and it fits fine. Is your north tech super tight to fit to the upper? I mean I have to muscle this thing closed. Also I can't get the rear take down pin in?? I'm using a aero precision upper I wouldn't think the aero precision upper is out of spec. I put my dpms upper on and it fit fine. I finally got the take down pin all the way through but it's tighter then a sum bitch! |
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Quoted:
Quoted:
NT Defense billet lower and LPK from PSA. No issues until I put the buffer retainer on top of the buffer spring, screwed the buffer tube in to catch and hold down the retainer. When I went to put the buffer in the tube the retainer was pushed down and was stuck. It was lubed before it went in. I've tried needle nose, rubber mallet, oil, and all I've ended up doing is pushing it down more. Any ideas? http://i.imgur.com/ht2LhHh.jpg Instead of a naked, conventional needle nose, try a 90 degree offset needle nose with each point shoved into two separate fingers of a latex (or nitrile) glove. The offset will give you a better approach angle and the latex glove will add traction. The rubber mallet may be useful if you hold the receiver with the pin facing down and then strike the area over the takedown pin. I like this approach I have a little needle nose like that. Comes in real handy. Freezer, NOT heat on the reciever. Both marerials handel hot and cold differently. I've never had anything happen in all of the weapons I've built. Usually the buffer retainer just falls into the hole, before you put in the spring. If you had a real tight fit from the start. You already had a proublem. If you try to drill it, it will proubably just spin, which might actually be a good thing. It might then pop out. Don't put the same one back in!!! |
It spent all night soaking in CLP breakfree and it's still stuck. Going to try some pb blaster or kroil before I get the drill and extractor kit out. I'll run out a bit later and get one of those bent needle nose, and don't worry I already have a new retainer and spring on order, just need to get this one out. Spent all day helping someone move  best not to work on it tonight.
Quoted:
I'm assembling my north tech right now and just checked my buffer retainer to be sure (using a bushmaster lpk) and it fits fine. Is your north tech super tight to fit to the upper? I mean I have to muscle this thing closed. Also I can't get the rear take down pin in?? I'm using a aero precision upper I wouldn't think the aero precision upper is out of spec. I put my dpms upper on and it fit fine. My pins were fine the whole lower went together really easy thanks to not using any roll pins on it. Fit to my YHM upper is also fine, just this damn retainer. |
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My .02, If the extension is installed properly (i.e. it WILL hold back the retainer), I would finish assembling everything and shoot it. The retainer is only there to hold back the buffer while assembling and disassembling the weapon, the BCG actually pushes the buffer back off the retainer when closed. Shoot a round or two, check, repeat. I think the recoil will pop it up enough to grab with a needle nose.
If the extension is not far enough to hold it back DO NOT do this as the retainer could pop up at the wrong time and jamb up the weapon. Not the end of the world but a PITA none the less. |
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Get it out? Yep I got it up this morning! I let it soak another 24hrs with pb blaster after the clp. Stuck the new needle nose down in and gave it a yank and I kept the buffer tube in place so it wouldn't go flying. It looks like I'm not the only one with this issue on NT defense lowers there was another post where a member had to clean it out because the retainer would not fully go down. I'll take it all apart tonight and figure out what the hell it was binding on. Brownells already shipped my new retainer and spring. Thanks for all the help guys! |
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