Take a look at this new patent from JAE: Looks like it may only be for the M14 but still interesting.
http://octechinnovation.files.wordpress.com/2010/06/07726060.pdf
http://octechinnovation.com/2010/06/18/rifle-assembly-j-allen-enterprises-inc-u-s-pat-no-7726060/
I don't know if they are planning to make their own rifles with this feature or make kits to ad them to existing receivers to have them attach to their stocks.
My understanding is that the screw still goes into the receiver though it passes through a jig that locks into an associated component that is a part of the receiver.
I haven't read it in depth yet but it looks interesting

http://octechinnovation.files.wordpress.com/2010/06/07726060.pdf
http://octechinnovation.com/2010/06/18/rifle-assembly-j-allen-enterprises-inc-u-s-pat-no-7726060/
As described in the patent, stability and maintenance of a “perfect fit” between the rifle stock and the receiver (which attaches the barrel to the stock) is important to marksmen since even a small amount of movement within the components of the rifle can disrupt their aim. Previous rifles utilized fiberglass compositions or “glass bedding” between the stock and the receiver to achieve the desired fit. However, such glass bedding degrades over time due to the recoil forces and torques generated during shooting and repeated assembly, disassembly, and cleaning of the rifle, making touch-up or re-bedding necessary. The patent discloses an improved assembly that avoids using such glass bedding, instead using a solid insert (e.g., made of metal, metal alloy, or composites) shaped and contoured to interlock and mate with the receiver and the stock to transfer the recoil forces during shooting from the receiver to the stock.
The company’s website shows a selection of precision rifle stocks for use of M1A, M14, and Remington 700 rifles as sniper rifles. The stocks are made of hard anodized aluminum with a painted shell in various colors including “coyote brown,” “SWAT black,” and “grit tan.” According to the USPTO database, the ‘060 patent is the first U.S. issued patent for J. Allen Enterprises.
I don't know if they are planning to make their own rifles with this feature or make kits to ad them to existing receivers to have them attach to their stocks.
My understanding is that the screw still goes into the receiver though it passes through a jig that locks into an associated component that is a part of the receiver.
I haven't read it in depth yet but it looks interesting