Ok so I am building the DSA receiver with a FCG purchased from Military Gun Supply. (Vector Arms set up)
The diagram and instructions are incomplete to say the least. The instructions and diagram state the bolt carrier rear (where the recoil spring rod engages) is to be enlarged to .375". But no depth is mentioned and does it need to have a taper at the bottom like it has now or should I use a 3/8" end mill to square the bottom shoulder?
***oh and it *appears* the carrier rail needs material removed from the top but the only one I have seen has it removed from the bottom. Which is it??