Does anyone make an M16a1 form factor stock that will work on a regular carbine extension?

Ideal would be a stock the exact size and shape of an M16 a1 rear stock, but that just slid on a mil-spec carbine receiver extension tube.

Am familiar with the Magpul rifle stock, etc. besides being too long, I don't want to change the receiver extension to a rifle tube/buffer.

I guess my fall back will be to put something like a CTR or STR on it and cheek riser adapters