I am a user not a builder

[Manolito]

I would like to ask a question. I know the lower is the serialized part of the firearm and the uppers can be sold and transfered at will as gun parts not a firearm. Could a new lower be designed that met any and all requirements and allow people to use the uppers they have?

I guess I am thinking a composit or cast design that resembled a remington 700 or a Thompson contender that would allow the upper to mate to it.
Feeding the rounds through a feed tube located in the stock removing the removable magazine.

Or is a rose by any other name still a rose?

[Peter.Steele]

Yeah, pretty easily actually.

[freonr22]

http://www.quarterbore.com/ar15m16/fab10.htm

like this? with a monsterman wrap

[Manolito]

Freon I was thinking of getting away from the look and moving towards a less controversial design. Only if the future holds changes in current laws. Think along the lines of no pistol grip wood or carbon stock with internal tube magazine.

But like I said I am a user not a builder.

[unusedusername]

Someone tried making an AR lower with a "more traditional design" once... behold the mock up of the Black Star 15



It would not function.

It never made it past mock-ups as the bolt carrier needs to be able to move rearwords into the stock when it is fired. This design did not allow for that. Draw a straight line backwards from where the bolt is, and you will see that it won't fit into the stock.

The bolt carrier has to be able to travel straight backwards about 6 inches.

The only way really to have the bolt carrier move straight back is with the current stock design where the top of the stock is either a tube, or a flat topped stock (like and A1, A2 design).

[BrokerB]

FN FAL para rifles do it perfect. No tube needed. but they also dont poop where they eat

[Manolito]

unused username thanks for the input that was exactly what I was thinking of except to remove the magazine and feed from a tube in the stock. So the nut to crack would be the 6inch rear movement of the bolt carrier group? Thanks for the input I hope somebody moves forward and designs something that could use the uppers.

Bill

[unusedusername]

feed from a tube in the stock.

I don't think tube-fed is a good idea, personally.

Tube feeding a centerfire cartridge with a pointy tip is problematic. Each cartridge in the tube would have the pointy tip of the bullet pressing against the primer of the next cartridge in the magazine.

If you drop your rifle hard enough or jolt it in just the wrong way you would set off all the primers, which is why you don't see lever action rifles in .223.

Before we design this thing, why would you want such a thing anyways?

[dieselpower]

Now it will work....

[hellraiser]

Now it will work....

With all the cal legal stocks ive seen im surprised no one has tried something like this.

Kinda reminds me of a bone stock saiga.

[ar15barrels]

The bolt carrier has to be able to travel straight backwards about 6 inches.

actually about 4"
The reason buffer tubes are so long is that they also contain the buffer and spring.
They can be shortened by 3" if you put the spring inside the carrier.

[SgtDinosaur]

Right after the first ban went into effect I saw ARs with the pistol grip sawed off at the Cow Palace show. Didn't see any after that, though.