buffer tube /detent issue

[msedward43]

ok guys, I have a quick question. I have a factory Sionics lower that I pulled out of storage to pair with one of their Patrol III uppers that I picked up and noticed that the buffer tube seemed to not cover nearly as much of the bufer detent as my other ones. Sending off a message to Josh over at Sionics to see what he has to say about it, but I just wanted to have you guys weigh in and see if my OCD is just going into overdrive, or whether there really isn't enough coverage of the buffer pin

I don't really build my own lowers so all I know is that my other Sionics/BCM/SOLGW lowers cover about 50% or more of the exposed buffer pin while this one seems to only catch part of it.


SfmNZgT.jpg

[26 Inf]

The problem when they stack like that is that if you turn the receiver extension/buffer tube one move revolution it will often be right up against the pin itself. That lip you can see on the end of the extension could be adjusted (material removed) so that you would be able to turn one more revolution, maybe.

I'd want more on there, but that's me. Could be that it will work forever.

I'm sure Sionics will try to make you happy.

[titsonritz]

The problem when they stack like that is that if you turn the receiver extension/buffer tube one move revolution it will often be right up against the pin itself. That lip you can see on the end of the extension could be adjusted (material removed) so that you would be able to turn one more revolution, maybe.

Personally, I wouldn't go cutting on my RE, an offset buffer retainer is a better solution to that problem.

https://gallowayprecision.com/offset...r-AR-15-rifles
https://truenortharms.com/ar15_defau...-retainer.html

[Disciple]

I believe you'll want to check the internal depth of the buffer tube. From SOTAR.

https://www.youtube.com/watch?v=eAuTHPdUchU&t=397s

[DoubleW]

I have one or two like that. Sometimes that’s how it happens. There’s not enough room for another turn so you get just the lip. I’ve never had any problems out of lowers like this. I wouldn’t worry about it. If it really bothers you, you could try multiple other receiver extensions to see if one screws in a little more over the buffer retainer.

[msedward43]

I believe you'll want to check the internal depth of the buffer tube. From SOTAR.

https://www.youtube.com/watch?v=eAuTHPdUchU&t=397s

it actually passed the quarter test.

[ViniVidivici]

Me, I don't like seeing them like that. I also want as much thread engagement between RE and lower as possible.

What I've done in similar situations, is undo things, and turn the RE in one more turn. If it doesn't play nice, I file a small round notch to accommodate the pin.

[Dutch110]

Me, I don't like seeing them like that. I also want as much thread engagement between RE and lower as possible.

What I've done in similar situations, is undo things, and turn the RE in one more turn. If it doesn't play nice, I file a small round notch to accommodate the pin.

This is the way. Small round file does the trick. I forget who's RE was set up this way but it had a tongue with a notch in it. Might be PWS?

[Disciple]

This is the way. Small round file does the trick. I forget who's RE was set up this way but it had a tongue with a notch in it. Might be PWS?

That I know of in alphabetical order: 2A Armament, Aero Precision, B. King’s Firearms, Dark Hour Defense, Patriot Ordnance Factory, Primary Weapons Systems, V Seven.

[georgeib]

Me, I don't like seeing them like that. I also want as much thread engagement between RE and lower as possible.

What I've done in similar situations, is undo things, and turn the RE in one more turn. If it doesn't play nice, I file a small round notch to accommodate the pin.

This is the way. Small round file does the trick. I forget who's RE was set up this way but it had a tongue with a notch in it. Might be PWS?

Would you not potentially run into the gas key contacting the receiver by doing this though? You're essentially shortening the RE by turning it in, no?