Me too. I think the target/service hammer thing is inconsequential -- I like them bobbed but it makes no difference (to me) in shooting, just less likely to hang up on clothing in concealed-carry mode.
The Cirillo quote mentions buying a bull-barrel (HB model 10 I assume) when they came out-- perhaps those came with the target hammer and he just never saw a need to change it. I read one of Cirillo's books and can't recall for sure, but maybe the stakeout squad guys weren't too concerned about concealing their carry guns - in which case a TH would be just fine. I seem to remember photo's of guys in plain clothes but wearing duty belt rigs.