is the mag conversion kit easy to install gish?
Super easy. There are two things to do 1. Drill one small hole for a grub screw for the block. 2. Some very minor mag modification (Need to file a notch in the AR mag to fit the locking latch) It won't effect usage in AR's.
http://eresystems.com/accessories/after-market-famae-accessories/ to convert back to regular mags the block just comes out.