AR Buffer questions

[Underdog 1,593]

Learning about ARs.  i got most of my lower receiver complete.   I lost my bolt-open lever pin when it went flying.  I have a second parts kit for another build that i took one out of, but I need another one.  Maybe I will find it.  I guess I lubed it up too well and it slipped when I was trying to get it started with a pair of needle nose pliers.  i was expecting the other spring and detent to go flying, but that installed easily  I hope I don't have to buy a whole lower parts kit to get it that pin.  What really has me frustrated was i bought a buffer tube last week.  i was told that it was milspec and would work for my carbine build.  However, there is no groove and I am questioning whether or not it is Milspec.  i have a Milspec stock that is coming in and i am afraid that it is NOT going to to work with this buffer tube.  't'he little tab on the receiver endplate will not slide on.  Can i grind it down a little and screw it on the grooveless buffer tube?  Why doesn't the buffer tube have a groove?

[GramGun79 226]

1 hour ago, Underdog said:

Learning about ARs.  i got most of my lower receiver complete.   I lost my bolt-open lever pin when it went flying.  I have a second parts kit for another build that i took one out of, but I need another one.  Maybe I will find it.  I guess I lubed it up too well and it slipped when I was trying to get it started with a pair of needle nose pliers.  i was expecting the other spring and detent to go flying, but that installed easily  I hope I don't have to buy a whole lower parts kit to get it that pin.  What really has me frustrated was i bought a buffer tube last week.  i was told that it was milspec and would work for my carbine build.  However, there is no groove and I am questioning whether or not it is Milspec.  i have a Milspec stock that is coming in and i am afraid that it is NOT going to to work with this buffer tube.  't'he little tab on the receiver endplate will not slide on.  Can i grind it down a little and screw it on the grooveless buffer tube?  Why doesn't the buffer tube have a groove?

No grooves as in the grove through the threads? if so i have never seen a buffer tube without one. I was once told an easy way to tell is by looking at the rear of the tube. A Milspec will be flat were a commercial will have a slight angle to it.

Post some pictures of the tube maybe someone here will be able to help further

[GramGun79 226]

oh and to where you can get replacement springs check out the link

https://palmettostatearmory.com/ar-15/lower-parts/individual-parts.html

[0Jeep4 87]

 Don’t know where your located, but Howell Gun Works stocks all pins detent springs etc needed for a build, I would assume any gun smith that does AR builds or compliance work should have it. 

[Underdog 1,593]

Quote

SARCO in Easton is awesome.  You can pretty much get any part you want there.   I was able to get everything I need including a buffer set. Once I pin the stock it should be finished.  

 

[Displaced Texan 11,731]

Do you have a pic of that receiver extension?

Reason I ask, I wonder if you have a rifle tube instead of a carbine tube. 

Edited to add, if it looks like one of the pictured tubes, you have a rifle receiver extension.