Glock 42 Caliber Conversion - A few years ago, it was fashionable to see stories about the transition from one caliber to another in gun books. In my opinion, the king of these conversions is the 1911. I have shot 1911s in .22, .30 Luger, 9mm, .38 Super, .40 S&W, 10mm, .400 Cor Bon, .41 Avenger, .45 ACP, . 44 Magnum as a single shot, .45 Super and .460 Rowland. Some conversions are gimmicks and not worth the effort. Still, if you're into that sort of thing, it's good fun.

Glock conversions are more practical. For example, I recently picked up a nice used Glock Model 22 .40 S&W that used to be a police pistol. The weapon was well used. Most have been traded for Glocks and some have been partially restored.

Glock 42 Caliber Conversion

Glock 42 Caliber Conversion

Service varies by agency and ranges from zero service in many small departments to excellent service in federal agencies. Most have spare magazines. I would think carefully about the price - you might be better off buying a 5th gen Glock. Unless you want a .40, no Gen 5 pistol.

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As for me, it doesn't bother me that all calibers are the same horse stamping, and you shouldn't be. The 9mm +P+ is a great police caliber, and the 9mm +P is good, especially the FBI's new Hornady Flex Lock, but the .40 S&W hits harder. It's physics. I've hunted deer in .40 and I'm not happy with it when it comes to 9mm.

Left to right: .40 S&W, 9mm and .22 LR. Being able to shoot all three with one gun is a neat trick.

My gun was marked Atlanta PD. In very good condition, came in box with spare magazine and original grip inserts. The advantage was that the gun was equipped with Glock night sights. Although dull, the steel sights have a much better aiming image than standard Glock factory sights.

The trigger is solid at 5.5 pounds. The finish shows light wear and the barrel shroud and muzzle show normal wear from firing. While I love the .40 and its power and don't find it difficult to learn and shoot well, the 9mm is cheaper and more common. While the .40 isn't a big hit, the 9mm has less recoil.

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I have a 9mm conversion barrel. The bolt on the .40 is a bit bigger and the extractor is different, so I wonder how these conversion barrels might work. I first tested the Glock with several rounds of .40 caliber. These include the 155gn Hornady XTP and the 180gn XTP.

Considering the more powerful cartridges, the .40 caliber pistol is suitable not only for personal protection and official use, but also for protection against animals. When it comes to wild dogs and big cats, I think the more powerful .40 caliber loads are a good choice.

Then I tried the conversion barrel. First I used a mixed bag of ammo left over from other tests including hollow ammo and FMJ ammo. I use .40 caliber magazines. A gun that fired a couple of hundred rounds was reliable enough for training, but not for official use. Point of aim and impact were acceptable for practice and recoil was just under .40. The accuracy was not inferior to the 9 mm Glock 17.

Glock 42 Caliber Conversion

Magazines fed the first 12 or 13 rounds, but tended to short the last two or three. The last three rounds have very little magazine spring force and we use a 9mm pistol with recoil set to .40. Switching to 9mm Glock 17 magazines made the gun perform better. Reliability has improved to around 95-98%, with frequent cycle failures in the last few cartridges.

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This is a great transformation for practical use. 9mm is economical, and with affordable and accurate loads like the Fiocchi 124gn FMJ, the conversion barrel offers acceptable practice. However, it is not reliable in operation, while the tested Glock .40 showed 100% efficiency in all tested loads. Perhaps the 9mm recoil coupled with the 9mm mags will increase the velocity.

Next I wanted to try the .22 caliber conversion block. The Tactical Solutions .22 conversion block is well made with good materials and promises to be a promising one. A spare magazine is not included and I assume the conversion is not intended for tactical use. But I ordered a spare magazine because I don't like having my gear without a spare magazine.

The conversion was fitted with a Glock frame and magazines loaded with Fiocchi .22 Long Rifle High Velocity ammunition. The gun and the conversion came close to firing. After 500 rounds of mixed ammo – all high velocity loads – the conversion never failed to feed, chamber, fire or eject. I like it. Accuracy is good, but the unit's practical accuracy is slightly below that of a 9mm Glock 17. Two inches at 15 yards or a little more is about average.

I almost forgot I have a Bar Sto Precision barreled .357 SIG. So this is actually a four caliber Glock. However, for practical use I stick to three calibers: .40 for defense, .22 for practice and practice, and 9mm for center fire practice. The .357 SIG is interesting though.

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I loaded the .40 magazines with Fiocchi .357 SIG FMJ rounds. The results were great. Function was 100% and absolute accuracy was the best of the tests – thanks to the Bar Sto barrel. I fired a few shots with the Glock, which is under two inches at 25 yards, but I only fired one that day with the Bar Sto barrel and Fiocchi ammo.

22 caliber conversions are the earliest conversions and it is interesting to have one firearm that fires more than one cartridge. Other guns are useful and make life interesting. With that in mind, my 3 gauge Glock should have a lot of uses.

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