.22 Kits


Shawn was talking about a the M261 kit. Here is a picture of a Ciener style .22 kit above a M261 and a M261 magazine insert.

Note how the Ciener kit has 2 rails and the spring is top center. This kit is notched, to allow for adding a weight for full auto use to try and prevent bolt bounce.

I understand that there are a few different kinds of M261 kits, but I don’t know about other styles. It looks like one of the others has a single left side rail and the recoil spring on the top.

This M261 kit has a single rail on the left, and a rod on the right where the recoil spring is. It has a buffer, perhaps urethane. It has a spring loaded tang on the rear, possibly to remove slack and keep the adapter forward in the upper.


  1. Interesting. I’ve only seen the style of M261 kit Shawn posted earlier. I’ve never seen the kit with the spring on the side like that so it’d be neat to be able to read up on the how’s and why’s there. I do know of two different style magazines. One style has a sort of “anti-tilt” at the front that helps steady the insert. They were considered to be more reliable according to the old timers.

    And don’t forget there was an issue brass deflector/catcher for the .22 kits. It snapped into the carry handle with a spring loaded detent in the scope mounting hole. It had a hinged box attached to the side that’d hold maybe a dozen or so .22 cases. I might actually have one if I didn’t trash it. Bought it when I got my 261 kit so long ago. It was essentially the same as the deflector used on the 5.56 rifles with the addition of that hinged box.

  2. My understanding is that with these kits there is a lot of leading in the barrel, both because most 22RF is just lead and not jacketed, and the twist rate is way too high for 22RF compared to 5.56 NATO.


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