View Full Version : Federal 205M vs 205MAR

James M.
10-30-2015, 09:46 PM
What are the differences in the regular 205M and the newer 205M AR primers? I haven't bought any primers in a long time, but noticed that the AR-type was at a local dealer. Thanks in advance for an answer to this question. James Mock

James M.
10-30-2015, 10:14 PM
I found the answer. The 205MAR has a harder cup for use in firearms with floating firing pins. James