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Service Grade: SIG SAUER's M11-A1

SIG has updated the P228-based gun, adding two rounds of capacity to the compact 9 mm Luger pistol.


Two years ago, 2011, was a time of considerable celebration as the much beloved Colt M1911 pistol completed a century of service to Americans. In 2012, we were pleased to see the M1911 return to official status with the adoption of a Colt-made M1911 Rail Gun for Marine Corps use. Undeniably, most American shooters are at least interested in U.S. service pistol development and use, if not in personal ownership of the guns in question. Civilian sales of the Beretta 92F pistols spiked after U.S. forces adopted the same gun as the M9. Another handgun that is currently in active service with the U.S. military, yet goes relatively unmentioned and unappreciated, is the SIG SAUER M11 in 9 mm Luger, once known as the P228.

I recently evaluated a new version of the gun designed for the civilian market. It is called the M11-A1, and what follows is my take on the pistol, the reasons for the difference in nomenclature and how the M11 relates to the M11-A1. First, we need to look at a little history to establish a sound basis for the comparison.

SIG SAUER’s P-series pistols date back to the 1970s. The SIG SAUER name represents a combination of two highly regarded makers—J.P. Sauer & Sohn of Germany and Schweizerische Industrie-Gesellschaft (SIG) of Switzerland. In the early days, the guns were imported into the U.S. by several firms—Hawes, Interarms, Browning—before the company started an importation branch of its own in the United States. At present, the firm continues to import some of the P-series pistols, but also manufactures the vast majority at its Exeter, N.H., facility. One such gun is the P220, which was the first import, and a gun that established the worth of several innovative features. In brief, the P220 was a full-size, recoil-operated, service semi-automatic in a number of popular chamberings—.45 ACP, .38 Super, 9 mm Luger and .30 Luger. Since the gun was available as a .45 and had a double-action/single-action trigger system, it was instantly popular in an America starved for such things. The P225 and P226 followed closely after the P220. Both were 9 mm Luger guns, developed for police service pistol trials in Germany and military service pistol trials in the United States. Eventually, of course, the 15-round-capacity P226 lost out to another make and model—the Beretta Model 92FS—but went on to great success in American law enforcement.

It was innovative in a number of features, but two of them stand out. One is tactical, the other mechanical. First, the lockwork of all the P-series guns to this point was different among a host of other double-action designs. Here, the decocker on the upper front corner of the left grip performed a single function—it decocked the hammer. Other pistols worked a manual safety into the design, but the SIG SAUER designers correctly perceived that the long-arc double-action pull for the first shot was safe in its similarity to trigger pulls on double-action/single-action revolvers. After the first shot, the recoiling slide cocked the hammer for single-action trigger pull for subsequent shots. Tactically, that made great sense—a flick of the thumb and a cocked pistol returned to hammer-down, double-action ready status.

The second major innovation was the use of a pistol slide made of several parts. The slide’s main portion was formed from a single piece of heavy gauge sheet steel in a pressing operation. Other parts were welded in place and the slide required less machining to become the upper half of a functioning pistol. That construction technique has proved completely serviceable for 40 years. When first used on early P220s, it scared the devil out of critics, but most of those guns are still working perfectly.

While the early P-series pistols covered a lot of bases, there was room in the line for some other models. In the mid-1980s, SIG SAUER offered a new 9 mm Luger model for concealed carry. Essentially an abbreviated P226, the P228 was shorter in length and height and had a 13-round capacity. Compared to the 15-round-capacity P226, the gun was significantly smaller even though it gave up only two rounds. By today’s standards, it was a medium-size pistol, but in the ’80s, it was the smallest full-capacity 9 mm available. An instant hit with police and civilian shooters, the concealable P228 began to attract attention in other quarters. I have been privileged to speak at length with a former SIG employee who was deeply involved in the process, but the military began a series of evaluations (sometimes downright bizarre) that led to the adoption of the P228 as an official U.S. sidearm. In the vast U.S. military establishment, there is a considerable need for handguns for people working in civilian clothes. Therefore, in 1988, military-marked and -finished SIG SAUER P228s went into U.S. service officially designated as the M11 pistol. Military investigators in Army, Navy and Air Force units, as well as Department of Defense personnel, use this excellent handgun. Once a pistol has achieved such status, it may be ordered, with proper justification, by any element of the Department of Defense. Use of the M11 (P228) is growing to include Naval aviators and others, who have an obvious need for compact survival equipment.

Although that was the beginning of the P228-as-M11 story, there are some other interesting twists and turns along the way. When a new mid-bore pistol cartridge came along in 1990, it took both civilian and law enforcement markets by storm. The robust little .40 S&W was an overnight sensation and is now the most popular law enforcement cartridge. Naturally, SIG SAUER wanted a piece of that market, but moved cautiously forward on designing a gun to handle the more powerful cartridge. In time, the solidly established firm introduced a new model known as the P229. It was a dead ringer for the P228, with one major exception. Instead of a multi-piece slide, the P229 used a conventional milled steel unit. The first makers of .40 S&W pistols quickly determined that the new wonder cartridge was something of a troublemaker. It was indeed a compact powerhouse in the terminal ballistics sense, but at the cost of high slide velocity and accelerated wear in general. It could be made to work, but engineers at SIG SAUER decided to use a solid slide and strong springs. The P229 has earned a good reputation in some 20 years of hard service. Eventually, the solid slide was used for P229s in the company’s proprietary cartridge, the .357 SIG. And not surprisingly, the concept spread to other SIG pistols in other chamberings—9 mm, .45 ACP, etc. As of 2012, all pistols in the P-series are manufactured with the one-piece slide.

The reader should not infer that there is something weaker, less satisfactory or outmoded about the SIG SAUER pistols with sheet steel slides. There is no particular reason for a company to build slides in two different ways, so when cartridges came along that required it, the company simply changed to the same method for all pistols in the P-series. With one exception, that is. When the government adopted the P228 in 9 mm as the M11, the gun was made with the multi-piece slide. It cannot be changed unless the military agrees to a modification. Chambered for the 9 mm Luger service cartridge and no other, the M11 (P228) is just fine the way it is. The P228 pistol is no longer in the commercial line; it has been replaced by the P229 in 9 mm. Even the terminology of P228 is no longer used.


The newest pistol in the catalog, however, is the M11-A1, a redesignated version of the P229 in 9 mm. It has most of the features of the M11, but is different enough to warrant a military-style nomenclature change. Obviously, SIG SAUER wanted to offer the discriminating civilian shooter a pistol that is as close to the military gun as possible. In appearance, the M11-A1 is almost exactly the same gun as the G.I. M11. The markings are different, but the finish, sights, controls and handling of the pistol are the same. A sample gun loaned to me by the New Hampshire maker proved to be an accurate and reliable service handgun.

The M11-A1 is a solid, rather chunky handful of gun that is a bit smaller than the typical military duty pistol. Recall that compactness was a design criterion for service use. Measuring 7.1x 5.4 x 1.5 inches and weighing 32 ounces, it would hide away in a pilot’s flight suit or investigator’s civilian clothes with ease. Finish is a dull nitride on the steel slide and black anodize on the aluminum-alloy receiver. Two-piece plastic stocks have a stippled surface that adheres well to the hand. As a bonus, the dovetailed three-dot sights feature SigLite tritium inserts. Controls are the familiar SIG SAUER type. At the top edge of the left side of the receiver and running forward, you’ll find the slide lock, decocker and takedown latch. The decocker serves no function other than to decock the hammer. This is a pure double-action/single-action trigger system, where the first shot requires a long arc, double-action trigger pull, after which the recoiling slide cocks the hammer for subsequent ones in single-action. The trigger system is the “SRT” style, which means short reset trigger. After firing the first shot, the shooter holds the trigger to the rear as the slide cycles. A very slight release of pressure allows the trigger to move a short distance forward to a point where it resets. As much as DA/SA trigger systems were once roundly cursed on training ranges, this is a superb system that requires training, but makes the gun both accurate and fast to use. It is a very nice gun to shoot.

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18 Responses to Service Grade: SIG SAUER's M11-A1

Nick wrote:
October 13, 2014

Sigs are more expensive, but if one is patient and looks in the right places, you can get deals; e.g. P229 with night sights, $537. P226 tacops $775. P227 FDE for $637. These were all new guns. My M11 cost out the door was $775.

Dave wrote:
August 13, 2014

I highly respect AR products but wonder why you did not do your homework before publishing this article. The M11-A1 is FAR more a P229 rather than a P228, by any estimation. You may (of course) do your own verification by calling Sig.

Tod Peters wrote:
July 18, 2014

Bought the M11-A1 and it is a dream to shoot. Picked it up for 800 bucks, what a deal. I love this gun. 1000 rds later.....flawlessly perfect.

O B Reid wrote:
July 13, 2014

Have owned my m11-A1 for over a year and it is pure perfection. Even though might be considered a wide pistol even with smaller hands grip and control is easy. Free and clear of safeties and D/A S/A is reassuring. It is always ready to go.

Davey wrote:
June 18, 2014

I've been on the fence on whether to get the M11 or the MK25. I found a decent deal on both at http://www.shootersplus.com so maybe I sould just get both. Yea... now I have to convince the wife. lol Nice article btw. Thanks

Jack Hanson wrote:
October 13, 2013

I carried a SIG P 220 throughout my LE career and went to a P229 in .40 as a retirement present. The first time my daughter fired it, she put 49 of 50 rounds from 7-15 yards in a 10-inch group. She will soon be the proud owner of a new M11.

Bill Hall wrote:
August 17, 2013

Got my M11 a few days ago, have put 300 rounds thru it. What a sweet gun!! Just wish it was not so wide.

Steve wrote:
July 20, 2013

I am a .45acp 1911 guy and like the ones made by Colt. I have a Combat Elite and a Wiley Clapp Commander. Anyway, I wanted a 9mm with a metal frame. I have owned to Glock 19s Gen 3 and Gen 4, a 92sf and a P99 AS. Of all the 9s I have owned this one is my favorite. I almost purchased another 1911 in 9mm but thought the Sig was interesting. The M11-a1 is a great piece. Got mine for $974.99. Worth every penny.

Col C wrote:
July 03, 2013

The grips are marked P228 but if look at the magazine it has P229 marked on it.

Ken Ames wrote:
June 08, 2013

The XD's 45 puts the debate to rest. A pocket pistol in .45 ACP will do the trick when you look for compactness and knockdown power.

Andrew Cole wrote:
June 02, 2013

My local firearms shop had an M11-A1 and the grips were marked P228. Curious.

Sean K wrote:
May 03, 2013

Sig's are some nice pistols, but I just can't get past that four digit price tag.

E. L. Appiano, NRA member wrote:
April 30, 2013

I own and use a SIG P-210.I will never look for anything better.

Jeff Hayden wrote:
April 29, 2013

Awesome Article the Sig Sauer pistols are the Best out there and their AR platform are the best as well I know I own Both

hmsailor wrote:
April 26, 2013

i hope you know the mag capacity is independent to the gun model. they are all interchangeable.

James Massaro wrote:
April 26, 2013

I have to agree, My P220 Elite Dark .45acp is simply perfection. In fact my other Sig, Sig 556 Rifle is just as wonderfully worry free, and beyond reliable - This looks to be another fine firearm - Well done Sig !

john stein wrote:
April 26, 2013

I purchased my Sig Sauer M11-A1 about 2 months ago, I have shot 3 full magazines in rapid succession and the gun performed flawlessly. almost 800 rounds later and I don't have a single complaint. it's an absolute dream to shoot.

David Zarate wrote:
April 26, 2013

I currently own a Sig P-228 I personally love this gun!