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The SBA3/4 uses a standard 6 position carbine buffer, tube and spring. The brace it's self is only capable of using 5 of the positions, which makes it "different".[URL=http://s152.photobucket.com/user/MPFD/media/0F965FCF-762E-4CCA-A6F1-6F38457B0A62_zpsgkpilezo.jpg.html]
The SBA3/4 uses a standard 6 position carbine buffer, tube and spring. The brace it's self is only capable of using 5 of the positions, which makes it "different".
[URL=http://s152.photobucket.com/user/MPFD/media/0F965FCF-762E-4CCA-A6F1-6F38457B0A62_zpsgkpilezo.jpg.html]