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What are the differences in a TRG-21 and TRG22?

-TRG-22 has "ears" on the mag bottom to help to grip it and pull it out. So stock fore-end is in front of the triggerguard radiused to accept these. TRG-21 mags have a slightly longer "floorplate" instead. So to use 22 mags in a 21, you have to grind the ears off, or mill out the plastic forend a bit.
-TRG-21 uses slightly different cheek/height spacers than the 22. Probably the same size/length, but the profile on the underside where it engages the "bumps" on the stock are different. 22 Length spacers work for both
-TRG-21 is probably blued verses parkerized for the bolt handle.

I would think accuracy is the same. But 22 has minor tweaks (mainly the mag ears) from testing/user feedback.....so I guess that is a pro, plus mags, etc more readily available. Same great trigger!
 
Also the muzzle on the 21 that we have is not threaded, the bolt handle is a slightly different shape, the forend attachment screws are captured inside the Anshutz rail on the 21 rather than being on the outside like the 22, the trigger body is steel on the 21 instead of aluminum like the 22. Functionally there's not much difference and in fact the action on the 21 we have is slicker than the phosphated 22 action.
Justin