
Originally Posted by
lysander
Oh, one other thing about sleeving.
The inside of an AR is not a tube, it is a tube with a slot in the top (for the carrier key) and slot in the bottom (for the magazine and FCG). In order to sleeve it, you would have to make a sleeve that is open on the top and bottom, or a sleeve that is open on the bottom and has a square channel on top. Two problems come to mind:
1) You can't shrink fit it, the open channel would tend to collapse.
2) It would probably make things worst. The wall thickness of an upper is only .095" thick, up in the charging handle slot, it is even thinner as the two slots for the charging handle eat up some thickness. To remove some aluminum and have a thin steel insert bonded in place probably wouldn't improve the stiffness....
If you really want to improve the stiffness, make a billet upper out of a solid rectangular block of 7075 1.25" thick and 1.88" tall (not including the lugs on the bottom), or make a regular upper out of steel.....
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