727 buffer tube
View of the 2 position tube showing the 2 holes in the relief cut on bottom of stock. This 2 position was used on all the carbine models up till the introduction of the 4 position tube on the M4 w/the exception of the 607 which utilized a completely different retracting system than all the later carbines ( see the album on the 607 for more details).
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Other Sizes: Original
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