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How To Convert Your AR-15 Into A .22 LR Show-Stopper

How To Convert Your AR-15 Into A .22 LR Show-Stopper

Image source: Pixabay.com

The AR-15 rifle is by far the most popular rifle in the US, especially among survivalists and people serious about home defense. The rifle is accurate, powerful enough, and endlessly customizable. The AR-15 has its detractors, and they have their arguments, but ultimately it is still the most popular rifle out there.

The AR-15 is typically chambered in 223/5.56, a caliber that is common, as well as small and compact when compared to rifle rounds. In fact, their size was one of the many reasons the US government chose the AR 16/ M16 platform over the larger, heavier, and more powerful 7.62 rifles. The average soldier can carry more 5.56 ammunition than they could ever carry with the heavier 7.62 rounds.

But even the 5.56 is still a giant when compared to the diminutive .22 LR round. The .22 LR is another popular rifle with survivalists who already own a main defensive rifle. The .22 LR round may be a poor defensive round, but it’s handy for hunting small and medium game, fending off predators, and as a general utility round. The .22 LR is also very small, quite light, and you can carry a box of 500 in a cargo pocket.

The small size, low recoil, low cost and easy shooting ability makes it the perfect round.

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So what does all of this have to do with anything? Well, what about the ability to convert your AR-15 to shoot .22 LR? You have probably seen these kits before and heard about how unreliable they are. That is generally true but, thankfully, CMMG has produced a kit that actually works. The CMMG kit is a stainless steel bolt that is an all-in-one kit.

This kit comprises of a bolt, a long extension that acts as a chamber, and an internal buffer. The kit requires you to use a 5.56 or 223 rifle. The internal 223/5.56 bore is close enough to the diameter of a .22 caliber long rifle that the round will remain accurate for shooting. The kit itself is a one-piece design that simply drops into the upper receiver of an AR-15. All you have to do is remove the 5.56 bolt, drop in the CMMG kit and close the receivers.

The kit does require the use of a specialized magazine, as one would expect. The kit comes with one polymer magazine, which will fit with any standard AR-15 lower receiver and locks in rock and ejects easily. The main difference, besides the caliber, is the fact the bolt will not lock open after firing the last round.

But Is it Reliable?

How To Convert Your AR-15 Into A .22 LR Show-Stopper

Image source: Wikipedia

Most of these kits fail in some way. I believe the reason the CMMG kit works so well is because of its polished stainless steel. This allows the weapon and bolts to run with the dirty .22 LR round consistently, round after round. CMMG has had some minor problems with some of their more experimental rifles, but this kit has run like a champ over 450 rounds of Federal auto match. And I didn’t lube the rifle or the kit before firing it. I just dropped it in, threw in a magazine of Federal auto match and started shooting.

The kit’s magazine loads 25 rounds and is easy to load until those second two rounds, where it gets pretty stiff. The charging handle only goes back about a 10th of the standard charging handle range. This is a bit odd at first, and takes some time to learn how to do it. At first, I would instinctively try to rip the charging back.

After 450 rounds, I had 10 misfires. These were rounds that failed to fire, which I chalked up to the standard unreliability you get with bulk .22 LR rounds. Cleaning the kit was as simple as spraying on some CLP, rubbing it down with a rag, and brushing the crevices. That stainless steel finish is a huge aid to cleaning the bolt.

Overall, the kit is excellent. It ran with some basic, cheap bulk ammo. I plan to do more testing with different ammo types, and a variety of brands. If the kit keeps working, it will replace my dedicated .22 LR for my rim fire needs. The only downside is the small loss of accuracy and having to purchase extra magazines online. The magazines cost around $25 apiece, which is somewhat expensive. But the CMMG kit is rock-solid so far, and it’s by far the best .22 LR conversion kit I’ve ever used.

Have you ever converted an AR-15 to a .22? Share your tips in the section below:

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2 comments

  1. I have the CMMG kit for my AR and like it a lot. Biggest downfall I have found is the bolt won’t lock back. They offer an additional kit to make that happen but I didn’t want to spend the money. Instead, I just use a chamber flag to hold the bolt open.

    When it comes to cleaning, I have heard that because 22lr runs dirty, it is a good idea to put your .223 or 5.56 bolt back into the gun and run a few rounds of the appropriate caliber to help push out some of the residue.

  2. Where do you get the kits.

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