There’s nothing complicated about rebarreling a 788, except they are different from the usual 700. There’s a relief in the threads in the middle of the (long) threaded shank for the front action screw.
Rem 700
Thread 1 1/16" (1.062") X 16
Engagement .69 (11 threads)
Rem 788
Thread 1" (1.000") X 20
Engagement 1.1" (22 threads)
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