i assuming this is the problem you ran into?
that is a TacSol on my 8.5" Dlask.
i found that either i needed to have the TacSol drilled and threaded longer on the inside or get another one that has deeper threading on the inside.
the problem is tacsol dosnt drill their threading down very deep and Dlask have longer threading on his barrels.
with one of mine i ended up getting a Dlask comp and on the one pictured above i ended up getting another comp that had deeper drilled threading.
for all intense and purposes there is no reason why you shouldnt be able to just drill out from the other side to meet up where the threading is.
its not like the comp is crowned at the end, your still using the the barrel crowning, so if you drilled out from the far end in to the depth where the comp threading started that would remove the barrier that your hitting.
you could then just go with the indexing that you bottom out on when you hit your barrel or you can get a crush washer, but for the TacSol comp it dosnt need to be indexed so youd be good without.
just an idea.