Took a chance today.

[dial1911]

I don't know. Its my first build. How high is too high?

The buffer retainer height is set by how far you screw in the stock buffer tube. The tubes generally have a little notch to fit around the buffer retainer. The notch limits the adjustment to full turns of the buffer tube.

I can't tell what kind of tube that is, but some pistol tubes space off the fixed ring on the tube... I'd hope screwed in "all the way" is right for those. Basically, you want the tube to keep the buffer retainer pin down to catch the buffer only.

Actually- now that I think about it, I might be totally wrong- the BCG is supposed to have a notch on the bottom to ride over the buffer retainer.

Sorry- back to square one.

 

[karlvv]

The buffer retainer height is set by how far you screw in the stock buffer tube. The tubes generally have a little notch to fit around the buffer retainer. The notch limits the adjustment to full turns of the buffer tube.

I can't tell what kind of tube that is, but some pistol tubes space off the fixed ring on the tube... I'd hope screwed in "all the way" is right for those. Basically, you want the tube to keep the buffer retainer pin down to catch the buffer only.

Actually- now that I think about it, I might be totally wrong- the BCG is supposed to have a notch on the bottom to ride over the buffer retainer.

Sorry- back to square one.

When I screwed in the tube I went too far the first time and the upper wouldn't close on the lower so I had to back it out 1 spin.

 

[dial1911]

When I screwed in the tube I went too far the first time and the upper wouldn't close on the lower so I had to back it out 1 spin.

Same way I end up doing it- that sounds right to me.

The buffer is like this one (carbine buffer):

Not like this (rifle buffer):

 

[karlvv]

Same way I end up doing it- that sounds right to me.

The buffer is like this one (carbine buffer):

Not like this (rifle buffer):

View attachment 18783

Yep.

 

[Righter13]

Do you have another AR you could swap spring and buffer from?

 

[Red Dawn]

Good:



Bad:

 

[dial1911]

Good:

View attachment 18784

Bad:


View attachment 18785

Holy crap! That is really, really bad!

 

[Red Dawn]

Holy crap! That is really, really bad!

Yeah over exaggerated a bit. I doubt the upper would even be pinned to the lower if it's that bad. LoL

 

[dial1911]

Yep.

Hummm.... I don't know. I'd probably take the upper off the lower and just try to hand cycle the BCG. Make sure it goes in somewhat smoothly up to the point the bolt hold open would go up into place.

 

[dial1911]

Yeah over exaggerated a bit. I doubt the upper would even be pinned to the lower if it's that bad. LoL

With enough force, almost anything is possible

 

[karlvv]

I just tried it with my other ar. It is Definitely something with the tube, buffer, or spring. Even with it open the big doesn't go down far enough,in the tube. I tried every combo. Nothing worked with this lower.

 

[Red Dawn]

It's a good looking build @karlvv and sounds like an easy trial and error fix. Nice job.

 

[dial1911]

I just tried it with my other ar. It is Definitely something with the tube, buffer, or spring. Even with it open the big doesn't go down far enough,in the tube. I tried every combo. Nothing worked with this lower.

Well, it sounds like you've got it narrowed down to the problem area. I'd probably do a side by side comparison of the tube, spring, etc. and try to find out what's different.

I'm sure it's nothing major- probably a fairly easy/inexpensive fix.

 

[Red Dawn]

I just tried it with my other ar. It is Definitely something with the tube, buffer, or spring. Even with it open the big doesn't go down far enough,in the tube. I tried every combo. Nothing worked with this lower.

You could grab a milspec tube assembly and stick it on there. $20-$40 bucks and done. Or swap springs out. Pics of the buffer, spring, and tube helps.

 

[Red Dawn]

Could it be commercial instead of milspec.

 

[Righter13]

So both springs and buffers work in the rifle. Do either of them work in the pistol? If not then it's the tube.

 

[karlvv]

You could grab a milspec tube assembly and stick it on there. $20-$40 bucks and done. Or swap springs out. Pics of the buffer, spring, and tube helps.

I just figured it out I think. The inside of the tube is only 6 3/4 inch. My other ar it's 7. It seems like this tube wasn't drilled out deep enough.

 

[karlvv]

So both springs and buffers work in the rifle. Do either of them work in the pistol? If not then it's the tube.

It's the tube fo sho.

 

[dial1911]

One last thought then I'm done... Those shockwave braces can dimple the tube if the set screw is tightened too much- I might be sure the inside of the buffer tube is still round and smooth.

 

[dial1911]

View attachment 18786

Could it be commercial instead of milspec.

The Inner Diameter is the same either way, so unless the inside is shorter, probably no big deal. Just my thoughts-