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I am trying to install a ace skeleton stock on a s+w 15.  I ordered the parts from brownells, they sent the stock and a A1 A2 kit.  the new buffer tube has a lip on it, and no grove in the bottom of the tube  also the threaded end of the tube is not long enough. It won't hold the buffer tube pin. WTF am i doing wrong

Hard to tell

You don't need the receiver plate, the lack of a groove isn't an issue

I have a shorty Ace skeleton off the rifle , I could post a picture of it if you think it could help?

I am trying to install a ace skeleton stock on a s+w 15.  I ordered the parts from brownells, they sent the stock and a A1 A2 kit.  the new buffer tube has a lip on it, and no grove in the bottom of the tube  also the threaded end of the tube is not long enough. It won't hold the buffer tube pin. WTF am i doing wrong

Post a PIC,  we can get it figured out for you.

I am trying to install a ace skeleton stock on a s+w 15.  I ordered the parts from brownells, they sent the stock and a A1 A2 kit.  the new buffer tube has a lip on it, and no grove in the bottom of the tube  also the threaded end of the tube is not long enough. It won't hold the buffer tube pin. WTF am i doing wrong

You aren't reusing the castle nut and end plate, are you?  You don't need either with a rifle length extension.  Screw it in until the shoulder is flush with the receiver.

You aren't reusing the castle nut and end plate, are you?  You don't need either with a rifle length extension.  Screw it in until the shoulder is flush with the receiver.

I was thinking that but the end plate shouldn't fit on a rifle extension and the castle nut would use all the threads up wouldn't it?

   

I watched a couple of videos, and it finally clicked I was trying to install the tube with the receiver plate  

 

OK, great

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YUP...  It was my first time changing a stock.... imagine the look on my face.  

 

LOL, Don't worry about it, you got it all figured out.  Now go out and have some fun with it.

That looks great! Thanks for sharing the picture.

Nice looking Rifle ya got there...............

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