ar-15 buffer tube problem

[mshootnit]

There was recently another thread discussing a buffer tube or castle nut problem and I wanted add some information which would be useful but the thread was closed before I could do so.
I have completed a few lower receivers and have had good luck with stag and armalite parts, the only buffer tube which was "cheap" to me was from Palmetto. It just barely engaged the buffer detent where my other tubes had a lip to do the job right. As far as castle nuts, never noticed a difference.

 

[Powerglide]

Bottom line , all the dealers and makers will have some returns.It takes a pattern for me to ditch them.They are busy folks these days. I could see where e-mails and calls couldn't be returned timely. My only real gripe is Ar15.com giving me the ax.I did bust a rule, plainly, but feel they have bigger issues, and egos, than my bannishment forever. Well, I feel better now. That said, let's see what Spikes is gonna do before we proceed on that issue.

 

[ApacheCoTodd]

I'm assuming from the context that you're talking about a CAR/M-4 receiver extension? That being the case, since you say it barely engages the retaining detent, are you not able to get another full turn in before permanently holding the detent down?

Usually, a fella should be able to get 1 complete turn between the rear most edge of the detent hole and interfering with the pin protrusion itself.

If you can't get the full turn outa it without obstructing the detent don't be afraid to make a bit of a relief cut for the detent if needed after being certain that the tube is not run in so far as to interfere with the closing of the upper receiver to the lower.

I've seen lowers with the buffer retaining hole incorrectly placed front to rear, side to side and off axis as well necessitating a rather "custom" fitting of receiver extensions.

 

[mshootnit]

thats a good point on modifying the extension to clear the pin so you can get another turn.

Don't worry too much about the forum you can always make your way back on there somehow. Its not like they are doing iris scans or anything.

 

[jsimmons]

I use the Primary Weapons Systems Enhanced Buffer Tude. It eliminates the need for a castle nut, and provides a QD sling swivel hole on both sides of the lower. It's much more expensive than a standard buffer tube/castle nut, but it's a much nicer unit too.

 

[madcratebuilder]

If you can't get the full turn outa it without obstructing the detent don't be afraid to make a bit of a relief cut for the detent if needed after being certain that the tube is not run in so far as to interfere with the closing of the upper receiver to the lower.

I've seen lowers with the buffer retaining hole incorrectly placed front to rear, side to side and off axis as well necessitating a rather "custom" fitting of receiver extensions.

This is not that uncommon. One of the first things I check anymore on new lowers. I install the RE, pin and spring and check fit with a complete upper.