View Full Version : 22 conversions for ar 15

April 8, 2011, 12:36 PM
Has anyone used a 22 rimfire conversion kit?

1. What kits have you used?

2. Have you compared different brands?

3. What are the pros and cons for each brands?

4. Do you know of any published reviews and or comparisons?


April 8, 2011, 09:20 PM
I've used an old Ciener kit. Ran well. Took some learning on how much lubricant to use to keep it running well.

I sold it, and recently bought a CMMG chromed kit. Runs great, the smooth chrome surface needs no lube, and it's use is actually discouraged.

Plus, CMMG have come out with some additions as of late that allow things like the bolt catch and forward assist to still be used with the .22 conversion, allowing training, Appleseed use to be more like using the full size caliber.


April 8, 2011, 10:04 PM
I heard that .223 barrels are .224 nominal and that 22RF barrels are .221 so the conversions are not as accurate as a dedicated upper for 22RF, and lead bad also from being undersized. Have you found any of that to be true with your conversion? (Nice BTW!)

April 8, 2011, 10:28 PM
About 6 months ago I purchased a CMMG Sierra .22 LR Upper Receiver w/Low Profile FSB from Palmetto State Armory. It is very accurate and lots of fun to shoot. It is a dedicated 22LR upper. $350.00 I have no regrets for purchasing it.



April 9, 2011, 12:33 AM
It is best to buy a dedicated .22 upper. The .22 bullets are smaller and can lead up and even damage a .223 barrel.

April 10, 2011, 01:18 AM
I agree with HKfan go with a dedicated upper you wont regret it