P220
When the Park Service went from revolvers to semi-autos, late in the game I might add, SIG was much in favor at the federal level and many US agencies were carrying them. SIG was selected for the NPS by default in a sort of way. The agencies selection process was so lengthy that funds were evaporating, and at the last minute, despite everyone's belief it would be .40 Glocks, we got SIGS. The story went that DEA had a bunch of overruns and we got the SIGS at a price, and I wouldn't doubt it. Initial transition pistol was the P228,and shortly thereafter, a supposed one time career choice of P228, 226, 229/.40, or P220. Note at the time that .40 was ONLY available in the machined slide P229. I chose the P220. I carried, trained and competed with (private purchase) theirs or mine for the next 20 yrs.
The P220 was a good duty pistol, reliable in the extreme, and spooky accurate. My only reliability issues cropped up with some original, heavily used 7rd mags late in my career. The MecGar stainless 8rd units that later shipped with the guns and are standard now, gave great service from their introduction forward, and are still running well in my personal P220. The P220 is a big gun, even a proper holster on my big self, makes concealed carry a challenge. I found it at it's best in a duty rig or carried openly dressed down for court or admin purposes.
Aside from the vintage 7rd mag issues described, the gun functioned well with good 7rd German mags, or the MecGar 8rd versions, feeding all manner of bullet shapes. I shot FMJ ball, truncated ball, and a variety of 230 gr JHP as issued over the years with absolutely no issues. I also shot a lot of 230 lead RN and truncated FN from my own personal purchase gun in IDPA without a hiccup.
I'll add that not only were my issue and personal purchase P220's accurate and reliable, but the 8-10 P220's under my care as armorer ran just fine as well.