Upgrading to 6.8 spc

[EdLaver]

What else besides a 6.8 spc upper do I need to build this rifle? Do normal 5.56 mags work with 6.8 or will I have to buy new mags also? If so, where is a good site?

 

[Zak Smith]

You need new magazines also.

C-Products and PRI both make and sell them.