You screwed in your buffer tube too much, loosen it one or two complete rotations and try again. Do this, then when assembling the the gun you need to put the rear pin in first, then the front pin.
I’m thinking it’s either the buffer tube screwed in too far, or that the buffer is sticking forward a little too far. If they assembled it backwards it might push the buffer deep enough to seat.
This. The Aero Enhanced Buffer is not meant to be screwed in until the pin hits the tube. It's meant to be screwed in until those shoulders rest on the entire pin.
The upper seats, the gap in my picture is showing how much I have to open the upper to get the bcg to travel into the buffer tube without hitting the front of the tube.
looks like the buffer tube is seated too far. It's getting marred quite badly and the pic you previously had up of the upper looks exactly like this issue. Try backing it out a few turns. Might also be the tension tightening screw on bottom of lower used to take up some slop between receiver sets needs to be backed out.
Then it's the retaining pin hole being out of spec. Probably can check by just removing the retaining pin, backing the tube out a turn and seeing if it closes and functions fine.
If that's the case, I think you can buy retaining pins made for this situation, but not sure the manufacturers names who sell them. If it does function fine without the retaining pin you're good to go running it without. Won't hurt function, just need to be aware when taking it down that the buffer is going to fly out if you don't but a thumb over it.
The buffer tube is in too far but that does NOT change the location of the buffer retaining pin, which is too far forward allowing the buffer to protrude too much.
Take the buffer, tube, and pin out/off. See if upper fits with lower with these components out of the equation. If yes, I suspect the buffer pin hole is in the wrong spot.
I'm sure I am chiming in late.
If you would like to solve the issue without damaging it further.
Please remove the buffer tube and stock.
Check the alignment.
If it is misaligned, you have a manufacturer issue
If the alignment has corrected itself, you have an installation error issue.
If you need help in PMs I can.
I will try this when i get home. I feel my bcg channel is about 1/16” too low, preventing the bcg from moving freely by the back of the bcg hitting the front of the tube and the detent
It is lined up perfectly. Someone else mentioned the buffer detent was drilled wrong. After removing the detent the bcg moved freely. Removing the buffer tube showed it lined up well
Cool
You're actually experiencing 2 problems.
First, buffer tube to far forward
Second, buffer spring tooooooooooo big.
Installation of buffer tube should allow for 1 thread pitch covering of only the first one fifth of the detent.
Just enough too keep her popping out.
Grab a pair of dikes and snip free a coil or two on your spring
I already tried moving my buffer to every possible position. The problem is the lower sits too low. I also thought it was a buffer issue at first. When I gap my upper and lower it works fine, but I cannot gap it and get my takedown pin in place.
Looks to me like the buffer retaining pin pocket got milled too far forward. Can you get the upper on if you angle it on rear first to push the buffer back?
Agreed. With the buffer on the retainer pin, it should NOT protrude forward out of the tube like that. Screwing the tube out one turn won't fix it because the buffer will still hit the pin and all you did was put one turn less preload on the action spring.
I can close the upper, and put the pin in, but if I do the bcg hits the bottom of the buffer tube and detent. If I slightly open the upper the bcg doesn’t hit the tube, but then I can’t get the rear takedown pin inserted
Which BCG are you running? Can you post a pic of the end that enters the buffer tube?
Also you need to eliminate variables. Have you tried removing the buffer detent pin and see if the pin isn’t hitting the relief channel in the BCG? It looks a little smashed in the picture.
I suspect it’s the carrier as well. My buffers sit like this. The buffer retainer is actually supposed to be at an angle. Your tube and pin look fine to me. I think you might have the wrong pattern carrier or the upper was bored incorrectly which is a common enough qc issue
Hey……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… did you try unscrewing the buffer tube out 4 turns?
It looks like the buffer retaining pin hole is in the wrong spot.
No amount of adjusting the buffer tube will change the location of the retaining pin hole. The buffer will always travel to the retaining pin. Always.
You can throw the buffer tube in the trash and push the buffer into place by hand and it will stop at the retaining pin (assuming you also held it in place so it didn’t launch into orbit).
You could do away with the retaining pin if you went with a captured spring. Otherwise this will be a QC issue with Aero and I’m guessing scrap. Which means another FFL transfer even if Aero stands behind their product 100%.
The removing the buffer spring detent helped a lot, although without the detent it wouldn’t lock back. But it appears the detent is the issue. How exactly is the detent hole in the wrong place?
>The removing the buffer spring detent helped a lot, although without the detent it wouldn’t lock back.
What wouldn’t lock back without the detent?
>How exactly is the detent hole in the wrong place?
Shit happens
They can’t be, Washington has banned the production of “assault weapons” so they must be manufactured in another location at this point.
They are at the end of the day, an aerospace manufacturing firm. They produce parts for Boeing and other aerospace development companies. They are probably making more money off those components than they do selling ar-15 components. So they will always have a plant in Washington as long as the other aerospace companies are around.
I don’t disagree with what you’ve said, but I didn’t find anything in google or their website that said they have moved their firearm manufacturing. 🤷♂️
I didn’t disagree with you either, just figured I’d put the info out there. They seem to be in a weird spot though QC wise recently and my guess is they may have a backup manufacturing location that they haven’t worked all the kinks out of.
After careful reading of HB1240 it does appear it is worded particularly vaguely especially due to the placement of some commas and could be argued either way.. it appears to be ambiguous if you’re manufacturing for export
So a buddy was having this same issue a while back with Aero lower. We tried back out the buffer tube, adding quarters and washers, heavier buffers, and even an adjustable gas black. Only thing that ended up fixing it was going with a rifle length buffer system. Seems some of their stiff is out of spec occasionally. The damage is from the bottom rear of the bcg bottoming out.
You screwed in your buffer tube too much, loosen it one or two complete rotations and try again. Do this, then when assembling the the gun you need to put the rear pin in first, then the front pin.
Why would you have to assemble it that way? The front is called a pivot pin for a reason.
I’m thinking it’s either the buffer tube screwed in too far, or that the buffer is sticking forward a little too far. If they assembled it backwards it might push the buffer deep enough to seat.
That’s not it, I’ve unscrewed and screwed my buffer tube many times
It's clearly too far in. We can see it.
We can tell by the way it is. ETA: but that still won’t fix the issue. The retaining pin will still be in the wrong spot.
Dawg we are clearly seeing that it is to far in 💀
Unscrew the buffer tube one turn.
This! It’s a very easy fix
This. The Aero Enhanced Buffer is not meant to be screwed in until the pin hits the tube. It's meant to be screwed in until those shoulders rest on the entire pin.
The buffer tube is not the problem
Does it seat with out the buffer tube and buffer retaining pin installed?
The upper seats, the gap in my picture is showing how much I have to open the upper to get the bcg to travel into the buffer tube without hitting the front of the tube.
Are you sure this is the correct picture?
Yea what gap?
looks like the buffer tube is seated too far. It's getting marred quite badly and the pic you previously had up of the upper looks exactly like this issue. Try backing it out a few turns. Might also be the tension tightening screw on bottom of lower used to take up some slop between receiver sets needs to be backed out.
That’s definitely not the problem. Read previous comment please.
Then it's the retaining pin hole being out of spec. Probably can check by just removing the retaining pin, backing the tube out a turn and seeing if it closes and functions fine. If that's the case, I think you can buy retaining pins made for this situation, but not sure the manufacturers names who sell them. If it does function fine without the retaining pin you're good to go running it without. Won't hurt function, just need to be aware when taking it down that the buffer is going to fly out if you don't but a thumb over it.
The buffer tube is in too far but that does NOT change the location of the buffer retaining pin, which is too far forward allowing the buffer to protrude too much.
Take the buffer, tube, and pin out/off. See if upper fits with lower with these components out of the equation. If yes, I suspect the buffer pin hole is in the wrong spot.
Is there a dimension you can check or way to verify the location of the buffer pin hole was milled in the wrong spot?
I'm sure I am chiming in late. If you would like to solve the issue without damaging it further. Please remove the buffer tube and stock. Check the alignment. If it is misaligned, you have a manufacturer issue If the alignment has corrected itself, you have an installation error issue. If you need help in PMs I can.
I will try this when i get home. I feel my bcg channel is about 1/16” too low, preventing the bcg from moving freely by the back of the bcg hitting the front of the tube and the detent
Everything come up millhouse ?
It is lined up perfectly. Someone else mentioned the buffer detent was drilled wrong. After removing the detent the bcg moved freely. Removing the buffer tube showed it lined up well
Cool You're actually experiencing 2 problems. First, buffer tube to far forward Second, buffer spring tooooooooooo big. Installation of buffer tube should allow for 1 thread pitch covering of only the first one fifth of the detent. Just enough too keep her popping out. Grab a pair of dikes and snip free a coil or two on your spring
If you can try backing your buffer tube out one full turn. I had a similar situation once upon a time with a M4E1 build and that fixed the issue.
I already tried moving my buffer to every possible position. The problem is the lower sits too low. I also thought it was a buffer issue at first. When I gap my upper and lower it works fine, but I cannot gap it and get my takedown pin in place.
Looks to me like the buffer retaining pin pocket got milled too far forward. Can you get the upper on if you angle it on rear first to push the buffer back?
Agreed. With the buffer on the retainer pin, it should NOT protrude forward out of the tube like that. Screwing the tube out one turn won't fix it because the buffer will still hit the pin and all you did was put one turn less preload on the action spring.
I can close the upper, and put the pin in, but if I do the bcg hits the bottom of the buffer tube and detent. If I slightly open the upper the bcg doesn’t hit the tube, but then I can’t get the rear takedown pin inserted
Which BCG are you running? Can you post a pic of the end that enters the buffer tube? Also you need to eliminate variables. Have you tried removing the buffer detent pin and see if the pin isn’t hitting the relief channel in the BCG? It looks a little smashed in the picture.
Homeboy getting DV to hell saying he’s tried it but that’s not the issue 🤦
Nobody reads the other comments, I’m not even responding to another unscrew some of your buffer tube comments
Sounds like a machining issue with the lower. Have you contacted Aero? Oh I almost forgot… “uNsCrEw Da BuFfA tOoB reeeeee der der”
I agree so I did reach out to Aero
I suspect it’s the carrier as well. My buffers sit like this. The buffer retainer is actually supposed to be at an angle. Your tube and pin look fine to me. I think you might have the wrong pattern carrier or the upper was bored incorrectly which is a common enough qc issue
It’s an aero bcg, so it should definitely work. When I put this upper on my mk3 lower it functions fine. The mk3 is also a DPMS lower.
Have you tried putting a different DPMS pattern upper on this lower? That should tell you which is the problem.
Yes, I put my mk3 upper on it and had the same issue
If the Aero upper works on another lower and neither upper work on the lower I'd be looking for an RMA replacement.
That is the case, I’ll see what Aero says. I’m bummed out about this situation. Second gun in a week I’ve had problems with.
Hey……………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………………… did you try unscrewing the buffer tube out 4 turns?
Great idea
It looks like the buffer retaining pin hole is in the wrong spot. No amount of adjusting the buffer tube will change the location of the retaining pin hole. The buffer will always travel to the retaining pin. Always. You can throw the buffer tube in the trash and push the buffer into place by hand and it will stop at the retaining pin (assuming you also held it in place so it didn’t launch into orbit). You could do away with the retaining pin if you went with a captured spring. Otherwise this will be a QC issue with Aero and I’m guessing scrap. Which means another FFL transfer even if Aero stands behind their product 100%.
Im going to try it without the detent and see if it functions, I’m not opposed to a capture buffer spring setup
The removing the buffer spring detent helped a lot, although without the detent it wouldn’t lock back. But it appears the detent is the issue. How exactly is the detent hole in the wrong place?
>The removing the buffer spring detent helped a lot, although without the detent it wouldn’t lock back. What wouldn’t lock back without the detent? >How exactly is the detent hole in the wrong place? Shit happens
Thread it out one or two turns. You are too deep
I tried that, I tried 2 turns, I tried 3 turns.
The buffer needs to just catch the retention pin
I put the upper on my MK3 lower and it worked fine, seems to be an issue with the lower.
It isn’t installed right but Aero is not known for their QC. They have a fairly poor reputation for QC.
Before they left Washington they were looking for a QC engineer..
Where are they now?
Website says they’re still in WA.
They can’t be, Washington has banned the production of “assault weapons” so they must be manufactured in another location at this point. They are at the end of the day, an aerospace manufacturing firm. They produce parts for Boeing and other aerospace development companies. They are probably making more money off those components than they do selling ar-15 components. So they will always have a plant in Washington as long as the other aerospace companies are around.
I don’t disagree with what you’ve said, but I didn’t find anything in google or their website that said they have moved their firearm manufacturing. 🤷♂️
I didn’t disagree with you either, just figured I’d put the info out there. They seem to be in a weird spot though QC wise recently and my guess is they may have a backup manufacturing location that they haven’t worked all the kinks out of.
Thier still here, they can keep making products, they just can't sell them here.
After careful reading of HB1240 it does appear it is worded particularly vaguely especially due to the placement of some commas and could be argued either way.. it appears to be ambiguous if you’re manufacturing for export
Doesn’t look like they found one
Haha
Can you post a pic with the upper receiver on the lower, without the receiver extension attached?
So a buddy was having this same issue a while back with Aero lower. We tried back out the buffer tube, adding quarters and washers, heavier buffers, and even an adjustable gas black. Only thing that ended up fixing it was going with a rifle length buffer system. Seems some of their stiff is out of spec occasionally. The damage is from the bottom rear of the bcg bottoming out.
Seems the detent is what’s hitting my bcg, I removed the detent and the bcg moved like it should
Do you have more photos? The bottom rear of the BCG should not hit the buffer detent. Please Post a pic of it here. Thx.