Upgrading Your Glock
With the right equipment, you can build an entire Glock pistol from scratch.
By Caleb Giddings
1/25/2013
For the past three years, one type of gun has dominated the equipment list at the Int’l Defensive Pistol Ass’n National Championships. IDPA collects a detailed equipment survey of all the shooters in attendance at each National, and the numbers don’t lie. The Glock reigns supreme. In fact, Glock pistols have become so popular that it is now entirely possible to build an entire “Glock” from the ground up that uses no actual Glock parts whatsoever. While that’s rare, what is common is for shooters to take their factory Glocks and improve “perfection” a little bit by adding a part here or a part there.
The two most popular models of the Austrian pistol for competition shooting are the Glock 34 and Glock 35. Chambered in 9 mm Luger and .40 S&W respectively, both the 34 and the 35 received the Gen 4 upgrade treatment as well. On the Gen 4 Glock 35, shooters get removable backstraps, adjustable sights, a reversible magazine release button and, of course, Glock’s new captive dual-recoil spring assembly, designed to help tame the sharp recoil of the .40 S&W cartridge. Thanks to the demands of competition shooters who rarely leave their guns stock, there exists a tremendous amount of aftermarket support for the Glock 35. Shooters will tune their Glocks to a high degree using such parts in order to eke out every last ounce of performance possible.
Usually, the first modification to a Glock is to remove the factory sights. Coincidentally, the Gen 4 Glock 35 received for this article arrived the same day a box from 10-8 Performance showed up. That box contained a set of 10-8’s excellent Glock sights, which feature a U-shaped rear notch and a fiber-optic front sight. With the new sights installed, the sight picture on the Glock 35 is crisp and clean. The wide U-shaped notch of the rear sight allows plenty of light around the front sight post. The fiber-optic rod on the front post gathers light, aiding the eye in the task of quickly acquiring the front sight to break a shot. Many shooters are happy once they upgrade the sights, but for those who want more there are nearly endless Glock modifications.
Proceeding in a logical manner, the next set of modifications is to the trigger pull. The Glock 35 comes from the factory with what measured out to about a 4.5-pound trigger. In models such as the 17 and 22, it is very common to replace the stock trigger connector bar with a 3.5-pound connector; however the Glock 35 already has Glock’s version of that lightened connector. Even so, Lone Wolf and Glockworx both make aftermarket 3.5-pound connectors, which will smooth and improve the Glock 35’s trigger pull. Adding an aftermarket connector is step one in lightening and smoothing the trigger pull.
Step two is to replace the firing pin/striker spring with a lighter weight spring. Because the Glock’s safe-action trigger mechanism only partially cocks the striker when the gun cycles, pulling the trigger to the rear completes the action of compressing the striker spring before it is released. Changing to a lighter striker spring will lower the weight of the trigger pull. With an aftermarket 3.5-pound connector and a 4-pound striker spring, the Glock 35 now has a trigger pull less than 3.5 pounds. Unfortunately, reducing the weight of the striker spring means that the firing pin itself has less velocity when it is driven forward. This can lead to light primer hits, an undesirable outcome in the middle of a match.
Firing pin velocity can be increased slightly by replacing the factory part with one that is skeletonized and, therefore, lighter in weight. Multiple companies make lightweight firing pins for Glocks. Some use titanium, and others use steel with circular lightening cuts in the body. Either method has the same result—restoring reliable ignition. With that in mind, however, the minute that the firing pin and spring are modified, the Glock 35 becomes a competition-only gun. It is not suitable for personal protection with the trigger pull hovering around 3 pounds. It is also advisable to try and stick with ammunition that employs softer primers once the trigger modifications are complete. Federal primers will give your race-Glock the best chance for reliable ignition.
The next stop on the whirlwind modification tour is the recoil spring assembly. The Gen 4 Glock 35 uses Glock’s new captive dual-recoil-spring assembly. It helps reduce the felt recoil of .40 S&W rounds, and is perfectly acceptable in its stock configuration. But “acceptable” is not the goal here—performance is. There are really only two options for modifying the recoil spring assembly in a Gen 4 Glock 35. The first is to buy a new dual spring captive system, but with a body made from steel or tungsten. That adds weight to the front of the gun, reducing muzzle flip between shots. The folks at www.glockstore.com make an excellent tungsten recoil spring assembly for the Gen 4 Glock 35. Unfortunately, with the captive systems the gun is still stuck with the factory spring rates. There is a modification for that in the form of an adaptor, which allows the use of Gen 3 recoil systems on Gen 4 guns. It is simple: The adapter fits in the oversize plug on the front of the slide, and the Gen 3-style guide rod and spring interact with it the same way they would a regular Gen 3 slide. That means lower spring rates are available for the Gen 4 Glock 35. Shooting full-power .40 S&W ammunition can get a little bit tiresome after an extended range session, and light competition/target loads frequently won’t cycle the heavily sprung Gen 4 guns. By changing out the Gen 4 recoil spring assembly for an adapter and a lighter spring on a steel Gen 3-style guide rod, the Glock 35 will then cycle everything from light, 125-grain frangible ammunition up to 180-grain jacketed hollow-points that meet the ground level requirements for major power factor.
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