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Vintage Colt XM177 stock on 2-position receiver extension. This stock was made from 1964 through 1985, it is poly-vinyl acetate coated aluminum. It is found on Colt R609 (XM177E1), R610 (XM177), R619, R620, R629 (XM177E2), R630 (GAU-5A), R639, R649 (GAU-5A/A), early R653 and R654.
Vintage Colt fiberlite stock on 4-position receiver extension. This stock was made from 1985 through 2002, it is some form of plastic. It is found on late R653, early R920 (M4) and early R921 (M4A1).
Current production Colt "Gen 2" M4 stock on 5-position receiver extension. This stock replaced the fiberlite in 2002 and is found on late production R727, R733, R735, R738, R920 (M4), R921 (M4A1), R933, R935 and R938.
Current production Magpul CTR stock on 6-position receiver extension. This is a commercially available stock that can be mounted to any mil-spec diameter receiver extension.
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