Ammunition Handguns

SIG Sauer .22LR Pistol Conversion Kits

A .22 conversion kit for your SIG SAUER pistol is a great way to get range time in at a fraction of the cost associated with centerfire ammunition.

For a time, SIG offered a .22 conversion kit for the classic pistols: the P220, P226, P228 and P229.

However, the company discontinued these kits and they are now only available as used kits that often sell for triple the original MSRP.

Before you drop your money on one of these used kits, let’s talk about what they are and if they make sense for your needs.

The SIG .22 Conversion Kits

Starting in 2008, SIG SAUER sold .22 LR conversion kits for the company’s most popular handguns: the P220, P226, P228 and P229.

A .22 conversion kit allows a shooter to practice with the firearm on the range, but at a less expensive cost since .22 tends to be very inexpensive. Additionally, the low recoil from a .22 is ideal for training a new shooter the fundamentals without causing them to pick up flinches from the sound and recoil from larger calibers.

SIG Sauer 22 conversion kit

Each conversion kit came with a slide assembly, recoil spring, guide rod, barrel and ten-round magazine. Adjustable target sights were included on the slide. The kits came in a hard plastic carrying case for storage and transport to the range.

A second kit was offered from SIG. The second kit was nearly identical to the standard kit but came with a threaded barrel. This allowed the shooter to add a variety of muzzle attachments including sound suppressors. 

The kit included a thread protector for use when a suppressor or other device was not attached to the barrel.

What Happened?

Unfortunately, SIG SAUER discontinued the .22 conversion kits for its pistols. While I am not privy to the decision making process, I can only assume that money played a significant role.

After all, if a product is not selling well, why would a company continue to produce it?

If the conversion kits were discontinued in spite of making a profit – well, I would deem that a significant mistake. Many people like to have conversion kits.

Personally, I own conversion kits for other guns including one for a Glock and another for ARs. Sadly, I failed to pick one of these up for my SIG P226 prior to the kits being discontinued.

How Did They Run?

There are two main complaints that a lot of people express regarding the SIG .22 conversion kits. The first is about the slide lock and the second relates to reliability.

From the feedback I have gotten on these conversion kits, the number one disappointment was the slide will not lock to the rear after firing the last shot. 

For anyone doing training – be it for self-defense or sport – practicing reloads is an important part of the training regimen. Having the slide lock back on an empty mag would be a very good upgrade to these kits so reload drills can be practiced.

Reliability also seems to be a bit of an issue for some shooters. However, that may not be SIG’s fault.

Like any .22 LR gun, the SIG pistols equipped with the conversion kits can be unreliable with some loads. That is just the nature of the .22 LR round, I am afraid.

In general, people seem to have better performance with “hotter” .22 loads. I recommend trying several, finding the one that works and then sticking to it.

Last update: June 3, 2021

By Richard Johnson

Richard Johnson is a gun writer, amateur historian and - most importantly - a dad. He's done a lot of silly things in his life, but quitting police work to follow his passion of writing about guns was one of the smartest things he ever did. He founded this site and continues to manage its operation.

23 replies on “SIG Sauer .22LR Pistol Conversion Kits”

Hi Don,

This is an older article, and I believe SIG no longer makes the conversion kits. Even if you find one used, it may not be compatible with the P227 as the kits were introduced 5-6 years before the P227 hit the market. I’m not sure enough on the internals to tell you if they would work, would need modification, etc.

Sorry I can’t be more helpful.


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