Polymer 45 ACP Pistols From SIG Sauer and Springfield
As recently as the September 2010 issue of Gun Tests, we referred to our evaluation of two similar 1911 45s as being something of a rarity. That's because the guns were essentially a different interpretation of the same design. More often, we compare a roster of test guns that, despite being of the same caliber and approximately the same size, end up demanding widely different skill sets to operate.
In this test we once again evaluate two closely related firearms chambered for 45 ACP ammunition. They are the $709 Springfield Armory XDM 45 XDM945BHC and the $712 SIG Sauer P250 45 Full Size 250F-45-BSS. Both pistols are full-sized guns with polymer frames and a barrel length of 4.5 inches. Each gun offers an accessory rail, low-mount sights, double-column magazines, and a measure of ambidextrous features.
On the surface it would seem that this was indeed another "apples to apples" test. But one noteworthy difference between the two pistols puts these guns in different categories, we believe. The trigger on the XDM 45 requires a takeup and press that was much shorter than that of the SIG Sauer P250 45. That was because the striker inside the XDM 45 is primed to a point just short of ignition by movement of the slide. However, the XDM 45 is categorized as a double-action pistol. This is based on the actions of pressing the trigger renders final compression and release of the striker. In a more obvious display of double-action form, the SIG Sauer operator has almost complete control of the ignition cycle. Pressing the P250's trigger rearward results in nearly a 1:1 ratio in terms of lifting the hammer and dropping it on the firing pin. Some shooters may find this difference too much to overcome, smashing our presentation as a test of similar guns. But as shown by the results of our rapid-fire tests, our staff found that both triggers could be operated quickly and effectively.
Our tests for accuracy were performed from a bench at the Top Gun of Texas indoor shooting range, www.topgunrange.com. We took full advantage of Top Gun's 20-yard bays and the slick mechanical target retrieval system recently installed by Action Target. Away from the heat and marauding showers in the Texas outdoors, we liked the privacy and safety afforded by the sizable ballistic barriers that separated us from other shooters. Accuracy testing was a slow-fire exercise, but we used an electronic timer to record our first shot and total elapsed times during our two action tests. Our first action test was performed from the 7-yard line with the shooter holding the gun in both hands and the front sight held at the lower edge of the shooter's peripheral vision. Our target was the IPSC-P (paper) targets from www.letargets.com. The action consisted of firing two shots to the body (a 5- by 9-inch rectangle A-zone), and one to the head. The head area measured 6.9 by 6.3 inches overall with a 4-inch-wide by 2-inch-tall A-zone, which on a human target terms would mask the eyes. We recorded ten separate runs.
In our second action test we wanted to know more about keeping the gun mounted in the hand throughout rapid fire. So, for this test the start position was with the gun directly on target held only in the shooter's strong hand. This meant our right-handed test shooter fired holding the gun with only the right hand. The IPSC-P target was placed 5 yards downrange and we concentrated on head shots only. Five runs of two shots each were recorded.
Test ammunition included 185-grain and 200-grain Hornady Custom XTP jacketed hollowpoint rounds. We also tested with the least expensive rounds we could find. They were Federal 230-grain FMJ rounds purchased for less than $17/50 from Walmart. Our action tests were performed using the 200-grain Hornady ammunition. Here's how we rated them:
Springfield Loaded Model PX9109LP 45 ACP, $1035
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Glock G34 9mm
According to the manufacturer, the Glock pistol was the first "industrially manufactured handgun with high-tech polymer grips." The barrels and slides are coated with what Glock describes as a "high-tech surface refinement" that they call Tenifer. The benefits of this "carbonitriding" coating are not only corrosion resistance and reduced glare but also resistance to abrasion. Tenifer coating is highly rated on the Rockwell Cone hardness scale at 64 HRC.
Some Glock pistols are available with different color frames, but our G34 was basic black. The defining feature of the G34 was its long 5.3-inch barrel with polygonal rifling, covered by a slide that included a gaping hole just to the rear of the front sight. This relief measured approximately 1.75 inches long by 0.75 inches wide. Glock says that this serves to reduce stress on the frame. The dustcover beneath the slide was also longer, making room for a healthy sized accessory rail, which was molded into place. The schematic breakdown of the Glock pistol with magazine lists only 34 separate parts, 36 if you count the magazine insert at the base plate (part 32a), and the front sight blade, part number 16a.
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Full-Size 1911s with Accessory Rails: Kimber vs. Double Star
When it comes to producing a Gun Tests evaluation, the process can be complicated by differences in operation. For example, a tight protocol, such as 9mm polymer pistols with 4-inch barrels and identical capacity, can challenge our test staff to master a different trigger for each gun. That won't be the case here, because the operational differences in these two guns are subtle, despite their vastly different cosmetics.
Our 45 ACP test guns were the Kimber Desert Warrior, $1441, and the Double Star DSC Combat Pistol, $1350. Despite having so much in common with the Kimber, the appearance of the DSC Combat Pistol could not have been further from that of the Desert Warrior. If you love the way your AR-15 "black gun" looks, the Double Star Combat Pistol provides a matching sidearm. Only the stainless-steel barrel hood and aluminum trigger broke up the understated color scheme. In contrast, the choice of color and the unusual grips found on the Desert Warrior set the gun apart from other 1911s. Officially, the color of the frame and slide were Desert Tan, but it could also be called khaki. The appearance of a lanyard loop at the bottom of the mainspring housing was also a distinctive touch.
To get started with the test, we first made sure each gun was lubricated. These are steel guns with a lot of metal-to-metal contact. We lubricated the slide and frame rails, the disconnector, the swinging link, each side of the hammer and along the outer surface of the barrel. The barrel lugs were lubricated by filling the matching wells beneath the slide with BreakFree CLP oil.
We began our tests by cleaning out the ammo closet, shooting each gun with a variety of rounds, including 200-grain lead semiwadcutters from Black Hills Ammunition. We then settled in at [IMGCAP(2)]our bench along the 25-yard line. Here we fired 10 round groups from a sandbag rest. Our test ammunition was Wolf 230-grain Copper FMJ with steel cases and non-corrosive primers, 200-grain JHP/XTP +P Hornady rounds, and Federal 230-grain Hydra-Shok JHP ammunition.
Our big question: Since the guns were essentially the same mechanically, would the statistical results be a dead heat? Or would our guns exhibit distinctly different personalities? Let's find out.








































