Here's a couple of testimonials from some department armorers and some LE instructors on Sigs in general:
"I have been using SIG pistols both professionally and personally for about 17 years now. Unfortunately, this will soon not be the case for reasons I will go into below. Initial platform was the SIG P226 in 9mm (which I have retained, and has over 16 years use with the only hiccups being some bad reloads). A few years ago when I transitioned from the military to law enforcement I switched to the P220 in .45. Doc and numerous others have pointed out the durability issues of this pistol in the past on this forum - with the general consensus being that as a regular sidearm it was sufficient (not a 1911, but some departments don't allow a choice in carry, so we do what we must); but that it certainly was not capable of standing up to the 100k round plus totals some 1911's have documented. I generally shoot 200-300 rounds a month, with an extra 300-500 round day every six months during qualifications and other training - so annual total (depending on other commitments) tends to be 2500 - 3000 rounds we'll call it. Not as much as the SWAT operators or some military units, but more than the average officer that I survey. Basically on par with someone who likes to shoot & wants to continue improving.
This durability assesment generally matched my personal experience - my initial P220 was issued to me after use by a previous officer; I personally documented approximately 3000 rounds through it with no issues in a 12 month period. Sole user change was the installation of Hogue grips. All department sidearms are detail stripped and examined by a certified armorer at least annually.
In the spring period of 2004 we transitioned to the P220R series of pistols, with the intent to furnish officers with rail mounted lights as funding became available. We also moved to the SIG factory 8 round magazine (which is a 7 round mag with one extra observation hole, a new baseplate & follower & a new spring I have come to find out.) No problems were noted during the initial transition phase.
Six months after our transition (about 1500 rounds through the weapon) I noticed the begining of a mushroom-shaped piece of wear and associated small crack at the rear of the breach block where it engages the hammer upon cocking. No similar wear was noted on the hammer, and no other points of contact were noted that would correspond. Additionally, the general wear of both the finish and the pistol was observed to be somewhat more than that of other weapons both personally and professionally used in my history. This was brought to the attention of our armorers & we observed it for another month; with the condition worsening the pistol was returned to SIG who replaced the breach block but provided no other statement or explanation.
During spring qualifications we began observing an abnormally large number of problems with both the weapons and the magazines. In terms of the weapons, again, the general wear of both finish and metal was FAR beyond anything in anyone's experience. Examples include grooves being worn into the slide rails, takedown lever holes being worn to almost twice the initial diameter, trigger pivot pins breaking in supported regions etc. Magazines were causing countless phase I and phase II stoppages with shooters of all ability levels (mine personally failed 5 times during a 50 round night fire course alone). Examination of magazines showed numerous cases of the springs displaying loss of tension and elasticity. One pistol with a documented 370 round count on it showed more overall wear than an "initial generation" department P220 SWAT pistol with over 15000 rounds documented. Please also bear in mind, probably 80% of officers don't fire more than 1000 rounds a year through their sidearms, so these are not high use weapons.
SIG was contacted in the early stages of the issues and had a factory rep respond, as well as countless phone calls. Having spoken with the department firearms coordinator, I have kept close track of this throughout. Long and short of all the explanations have boiled down to "We don't know why." Metalurgy, heat treatments, coatings and pretty much everything else they can think of have been checked with no definitive answers.
Lest we think this problem is limited to the P220 series, we have also been in contact with numerous other agencies using the SIG. The general consensus seems to be that for those agencies which have purchased newer weapons within the past couple of years, issues are cropping up far far faster than ever seen before. It does not seem to be limited to caliber, style or anything else - SIGs aren't lasting like they used to, and armorers are repairing a lot of them.
Repairs don't seem to be fixing the problem either - my breach block is starting to show the same signs of wear as the last one, and again at an "early" round count. Several other weapons are also showing the same.
Fortunately my department has addressed this issue proactively, a wise step considering the potential liability issues involved. A replacement has been identified and awaits final approval and budgeting for holsters. All officers have been given a 7 round magazine to replace the 8 round in the weapon, so at least our initial load SHOULD function as designed. They also have tried to inform as many other departments as possible throughout of the problems we are experiencing, so that others can be prepared if needed.
So, to summarize a lengthy, boring ramble - I can no longer in good conscience recommend SIG as a good brand to people I know. I was rather surprised to see a company with this size and reputation display the apparent loss in quality, the lack of an effective response, and the overall attitude when the problems cropped up, especially on the scale involved. Yes, I will keep my WEST German marked P226 around due to the memories and positive history involved, but it's now like a relic of a foregone age - like when cars were made to last. In fact, I now carry it exclusively off duty as opposed to my P220 - I'd rather have a 9mm that I KNOW works, as opposed to a .45 that MIGHT work.
The only amusement in the whole process has been watching a bunch of staff members have to do a "tap, rack, bang" who probably haven't had to remember the skill in years..."
"Back in the mid 1990's SIG was having problems with frame cracking on the 220 in .45 and the 229 in .40 and .357 SIG.
The nines somehow seemed to escape this issue.
SIG kept increasing the frame thickness in various areas trying to beat the problem.
In the meantime the FBI quit allowing late model SIG 220s for duty use and published a memo regarding the series of frame serial numbers after which the cracks began to manifest.
(About this time FBI started using the Glock 19 and 22, and began having a series of "issues" with them as well. There was some little widget inside the tupperguns that kept breaking.)
The changes in 220 and 229 frame size permutations were so numerous that by 1998 we quit providing GunGlove SIG holsters unless departments provided a weapon to mold off of, and then we only warranted the holsters to fit that particular weapon."
"SIG had a production run of P226s in the mid-1980s which began to show cracks in the frame rails just ahead of the magazine well. Since I didn't own one, I can't speak for the round count from personal experience, but I was told that the cracks occurred with a relatively low number of rounds fired. During one of my early firearms instructor classes with an instructor from the NC Justice Academy, he was notified by SIG to check all the 226s which came into his classes. He had a school-owned 226 which showed a hairline crack down in the rail groove on the frame, just forward of the mag well. There were two students using 226s, & they did not show any cracks, nor did the two P220s in the class. I was told later that SIG replaced the frame on the Academy gun, & blamed the problem on the alloy used for the frames on that particular production run. Again, according to my source, the problem occurred only on a limited number of P226s, and not on any of the P220s or 225s. One theory was that the cutout in the frame rails for the double-stack magazine of the 226 made them more susceptible to cracking. All of the SIGS at that time were being produced in W. Germany, as far as I know. The department I was with at the time was transitioning to P220s. When I left that department in late 1993, all of the original P220s were still in use, with absolutely no mechanical problems & only routine cleaning. Since that time, all of the original 220s have been rebuilt by the department armorer at least once, but they are still in use."
"Received a report today from a large nearby agency that their new Sig 220R's are exhibiting parts failures even with low round counts. Their 10+ y/o Sig P226's continue to work well."
Back when the FBI was using Sigs, they took the P220 .45acp off their approved duty pistols because it was suffering so many problems. Now that I work for the DOI I keep in contact with FLETC armorers who process hundreds of Sigs every year for maintenance. The P220s suffer roughly 5-10times as many parts breakages as the other models which include trigger bars, trigger springs, frame cracks, and broken extractors. Most of which related to the P220's lack of adequate slide mass and overall strength. Sig seems to have gotten it right with most of their other models though. The Sig P226 9mm and P229 .40/.357/9mm are going strong in agencies like the DOI, DHS, DOD, ICE, and the USCG. Sig was producing frames in the US from about 2002-2006 which were having problems, and now they have returned to making the frames in Germany which seem to be much more robust.
If you shoot a lot with defensive loads, then the P220 is probably not for you. Sure, it will hold up with reduced power practice ammo for tens of thousands of rounds, but in the case of military/agency use that run full power defensive loads(including +P) you can expect a life span of probably 20k rounds or so. For some people, that is a lifetime worth of shooting.
If you look at the H&K MK23, it is a beast of a gun. The military specified that the .45acp they wanted would have a service life of 30k rounds of 200gr+P ammuntion which really puts a beating on a pistol.