These CMMG (Atchisson Type) Conversion units can change your AR15 type rifle from it's existing .223 caliber down to the inexpensive .22LR rimfire cartridge.  Matte (parkerized) finish.  Installation of conversion takes less than a minute, and is achieved with no permanent alterations to your firearm. It can be quickly returned to it's original caliber.  Basic price is for conversion kit and (1) 25 rd magazine (or optional 10 rd magazine).

25 round magazines cannot be shipped to CA, HI, MA, MD, NJ, or NY.  If you live in one of these states, select the 10 rd magazine option!    

-- IMPORTANT --

Due to the many manufacturers of AR15/M16 type weapons and components, minor fitting and/or adjustments may be necessary to obtain reliable functioning of the CMMG conversion kit in your weapon.  MacTec is not a warranty or repair center for these products and any issues related to a factory defect must be addressed with the manufacturer.  MacTec cannot accept any returns of these conversion units that have been used, installed, or attempted to be installed in the customer's weapon.  Please refer to our general Return Policy for details.