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Posted: 9/18/2008 5:01:42 AM EDT
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What do I need to use if I intend on using a a spare rifle buffer tube on my 9mm pistol build? From what I can tell I need something similar to the RRA buffer spacer. Should I use the standard buffer spring or (shorter spring) with a 9mm buffer? |
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9mm buffers are generally used in a carbine buffer tube w/ a carbine length buffer sping. Standard rifle buffers are normally used in a standard rifle buffer tube and use a standard rifle length buffer spring. Haven't a clue what you are asking, but hopefully this information will be of some use. mike |
You need a heavy carbine type buffer. |
| This might help. I understand member Slash originated the heavy 9MM buffer. |
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If you're using a rifle tube, a stock rifle buffer is supposed to work with 9 mm. I'm using that set-up on my 9 mm AR carbine, with a RRA 9mm upper and Bushy lower with an A2 stock (with of course the rifle buffer tube). The only difference I have is that based on the example of some smart guy here, I replaced the stock rifle buffer guts with a peice of brass rod that I machined to fit, which gives it more weight. This was cheaper than doing what you're doing, and IIRC I think got a heavier buffer. Some people say they shoot 9mm AR carbines with the stock rifle buffer just fine. |
| If you are using a rifle length buffer tube, you should use a rra spacer, and a big 9mm heavy buffer (q-buffer from slash), spikes 9mm buffer, or from what I gather hahn makes a pretty nice one. All of which need to be used with a carbine length spring. You can use no spacer, and use a rifle length buffer, but you will break more bolt catches, and the weight and timing may be off causing fte's. I have used the q-buffer, and also rra's buffer, and both worked with a carbine tube. |
If you desire, lose the guts from the rifle buffer, and install a machined brass rod inside the buffer body, this will bring weight to approx 7.0oz. 
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SBR7_11, I stole your idea.  I machined a piece of brass rod that I had laying around to fit in place of the bits inside my rifle buffer. It works great and I saved a lot of $$ versus buying a carbine buffer, spacer, and new carbine spring, and it weighs more than most. Mine came out to somewhere over 6.5 oz, 'cause I wasn't paying attention to my dimensions while I was learning to use someone's lathe.  The folks here who are saying one HAS to buy a carbine buffer, the matching spring, and spacer, with the rifle tube, are wrong. |
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My 9mm was setup with a rifle buffer for a while they are around 5 oz. Didn't break anything but only probably put 1k~2k rounds through it. Now it has a carbine stock and 5.4oz dpms I think buffer. Works the same except I put in the wolf spring extra power spring. Works great ether way. |
Brian cut mine so close that when it is started into the buffer body and let go of the brass dowel, you have to wait for it to push the air out as it slowly dropped into the body. I think I put 1 rubber disc in the buffer first, then the brass, and then the bumper plug and roll pin. They had a digital scale there they use for shipping, it showed 7.04oz, I run it for both 9mm and 5.56. I just swap upper and mag and shoot. |
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