The narrow slide version is very prone to cracking by all accounts. Be sure not to shoot "hot" ammo through it. The manual recommends 130 FPE or less. You can get some ammo ratings here:
I use the Blazer ammo, which is the least "hot" I could find.
The difference between a citizen and a civilian is that the citizen makes the safety of the body politic his personal responsibility. The civilian does not.