Beat-up AR buffer edges? Offset Buffer Retainer might fix that

True North Arms Corp

True North Arms Corp

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normally when you close the receivers the BCG rear should push the buffer slightly into the buffer tube so that the buffer does not touch the buffer retainer.

sometimes dimensional creep/tolerance stackup (especially with parts from different manufacturers) causes the buffer the rest/impact on the buffer retainer during use. this manifests as a beat-up buffer and retaining pin (sometimes a broken retaining pin).

HGjbj5B.png


One possible solution is an Offset Buffer Retainer, basically a buffer retainer but the pin is moved forward slightly. This may be enough change so that the buffer will rest on the BCG and spare the retainer the beating. the retainer has a little shelf to interface with the buffer tube and help it stay in the forward position.

https://truenortharms.com/ar15_default_store_view/offset-buffer-retainer.html

 
Just remove the pin from an out of spec lower as it is there only for convenience. Ya ya people will laugh.
 
True North Arms Corp said:
normally when you close the receivers the BCG rear should push the buffer slightly into the buffer tube so that the buffer does not touch the buffer retainer.

sometimes dimensional creep/tolerance stackup (especially with parts from different manufacturers) causes the buffer the rest/impact on the buffer retainer during use. this manifests as a beat-up buffer and retaining pin (sometimes a broken retaining pin).

HGjbj5B.png


One possible solution is an Offset Buffer Retainer, basically a buffer retainer but the pin is moved forward slightly. This may be enough change so that the buffer will rest on the BCG and spare the retainer the beating. the retainer has a little shelf to interface with the buffer tube and help it stay in the forward position.

https://truenortharms.com/ar15_default_store_view/offset-buffer-retainer.html

Click to expand...

Right. For a frankengun, I can see this maybe being a thing.

But with an upper/lower/BCG from a single manufacturer, this isn't a problem you can encounter based on tolerance stackup, as it a single part, the upper, or the lower, or the Bolt Carrier Body, that is out of spec by a significant degree in order to produce this problem.

Would not a buffer with a rebated rim also be a reasonable solution? Something like this. https://www.google.com/imgres?imgur...vfAhWRTt8KHVyhCUcQMwiaASgvMC8&iact=mrc&uact=8

I understand those parts in particular are for a different purpose, so you might have to fiddle with the dimensions, but this could also work.
 
Cameron SS said:
Is there a known issue with the Andersons?
Click to expand...

It's been known to occur with Anderson lowers, but not frequently enough to merit flaming the whole brand. Anderson lowers are just fine the overwhelming majority of the time. Their lemon rate will be higher than Diemaco, but they're also $100.

The only lowers (and uppers for that matter) I've found to be consistently out of spec were NEA.
 
neoconfection said:
It's been known to occur with Anderson lowers, but not frequently enough to merit flaming the whole brand. Anderson lowers are just fine the overwhelming majority of the time. Their lemon rate will be higher than Diemaco, but they're also $100.

The only lowers (and uppers for that matter) I've found to be consistently out of spec were NEA.
Click to expand...

They're just NEA spec.
 
Cameron SS said:
Right. For a frankengun, I can see this maybe being a thing.

But with an upper/lower/BCG from a single manufacturer, this isn't a problem you can encounter based on tolerance stackup, as it a single part, the upper, or the lower, or the Bolt Carrier Body, that is out of spec by a significant degree in order to produce this problem.

Would not a buffer with a rebated rim also be a reasonable solution? Something like this. https://www.google.com/imgres?imgur...vfAhWRTt8KHVyhCUcQMwiaASgvMC8&iact=mrc&uact=8

I understand those parts in particular are for a different purpose, so you might have to fiddle with the dimensions, but this could also work.
Click to expand...

a chamfered buffer would work too
 
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