Midway, Brownells, Sharp Shooter Supply, Savage. I assume by "bolt block" you are referring to the front baffle with the extended bolt stop and the "magazine block" is built into the .223 sized magazines.
Thanks, I'll check with sharpshooters supply. I called brownells and they do have the from baffle, but the only magazine assembly they have for .223 is for the long action. If any one has the .223 magazine assembly i would certainly be interested in it.!!!!