22lr conversion and upper. plz read

[steven58]

About the only upper a conversion kit won't work in is a piston/op-rod type where you cant remove the op-rod.

I have a POF piston upper. To use a conversion kit I first remove the BCG, just like on a DI AR, then I remove the op-rod. Otherwise you wont be able to fully seat the conversion kit in the chamber as the op-rod sticks out slightly further than a gas tube does.

I would guess that a piston AR like the Ruger, where the op-rod is not easily removable, would preclude use of a standard conversion kit.

[rman43]

The very newest version of CMMG's conversion kit has a longer relief cut in the top of the bolt and will work with any piston upper without removing the rod. The older versions have a shorter relief and may cause problems with piston guns unless you remove the rod.

[shadow65]

Correct. The CMMG version is compatable with piston set ups like Adams Arms.

[steven58]

Thanks for the info rman43,

I will pass that on to a few friends that bought (into) Ruger piston ARs and were thinking of modding conversion kits. Good to see that CMMG is, as usual, ahead of the curve.

[ummagawd]

i can say that the CMMG kit works with the Timney drop in 3lb trigger for those who are interested in that setup....