18 January 2009

Tinkering Around

Kaylee has a different stock.




This is a plastic 3rd gen, mil-spec CAR stock.

It's a bit different from the 4th gen, commercial stock she started with.



There are two main differences between the mil-spec and commercial receiver extensions (the tube that the stock slides on).  Mil-spec is slightly smaller in diameter and is slightly shorter overall.  As I mentioned before, I was not using the extra length on my 4th gen commercial stocks.  Now all three of my carbine stocked guns use full extension.

The generation is unrelated to the mil-spec/commercial distinction too.  1st gen is the original R607 stock. Pic Here. 2nd gen is the aluminum stock that started issue on the XM177 in Vietnam and continued to the mid 80's.  Like this one I am using on my XM177E2 / GAU-5A/A clone.



3rd gen is basically similar to the 2nd except that the material is now fiberlite or plastic instead of aluminum.  It was introduced just after the end of Vietnam in the mid 80's and continued all the way to the early M4A1 models.

4th gen is plastic with a larger butt plate and a sling swivel at the toe of the stock in the same location as it would be on a rifle stock.  This was introduced with the M4A1 in about 2006 2002.

From top to bottom.  Full fence lower, early pistol grip, 2nd gen mil-spec stock.  A2 lower, A2 pistol grip, 3rd gen mil-spec stock.  A2 lower, A2 pistol grip, 4th gen commercial stock.  A2 lower, Magpul MIAD pistol grip, Magpul CTR mil-spec stock.

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