Newb buffer tube question

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I have a SBA3 brace I'm attempting to put on a pistol lower I just got from PSA. It's EXTREMELY tight. I can get it started but even lubed with silicone I can't get it all the way on.

Have I got a commercial vs MIL spec problem here? If they weren't the same size I didn't think they would fit at all? Suggestions for a way forward?
 
You may have a commercial buffer tube, an abnormally tight SBA3, or you may have a knockoff SBA3. The China clones fit MUCH tighter. You can take a dowel and some sandpaper to open the ID up some if need be. I'll assume you're pulling down far enough on the detent that it's not interfering mechanically.
 
Supermatch said:
You may have a commercial buffer tube, an abnormally tight SBA3, or you may have a knockoff SBA3. The China clones fit MUCH tighter. You can take a dowel and some sandpaper to open the ID up some if need be. I'll assume you're pulling down far enough on the detent that it's not interfering mechanically.
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It's super tight before I ever get to the detent, and the only way I can even get it that far is by using lube + all my weight with momentum, and then I can't hold the detent down and use enough force at the same time. I've already backed it off and I think I'll try the dowel suggestion. đź‘Ť
 
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OK looked at this again and I am an idiot. I've been trying to cram a cylinder style pistol buffer tube into a brace made for an adjustable carbine buffer tube.

The only other AR pistol lower I ever made also had this kind of tube but the SB brace I had then (long time ago, I think it was the original brace) was designed for it. It just slipped on and I used tape for a friction fit. Now I either need to switch the buffer tube or the brace.

Do they still make braces like that? If I order a carbine tube will it be compatible with the buffer, spring, etc. that's in there now?

I guess I should have ordered a carbine lower instead?

Thanks for the help.
 
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If you want something for a plain tubular tube I recommend one of the KAK blades.
 
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