M14/M1A Magazine & Point Of Impact (POI)
Many years ago it was discovered that not all M14 mags when used in the same rifle had the same POI. This problem was discovered during the 200 yd. rapid fire stage. Two shots centered and a tight 8 shot group several inches away.
The Marine shooters took a supply of mags to the 300 yd. line, this gave a better line of deflection for test, loaded up the mags with 8 rds. and fired strings until they had two or more mags the impacted in the same place. These mags were marked and used for the season. Scores improved. It was also discovered that these same matched pairs of mags would not necessarily give same POI when used in different rifles. The mags were then numbered to a specific rifle from then on.
This was not a constant problem, but it occurs more often than you might expect, next time you are at the range see if your mags shoot on top. Nobody ever figured out why this happens, but I heard an USAF shooter say, " Because the springs give a different head pressure to the bottom of the bolt Dummy". Sounds good to me, USAF????
By Art Luppino
Comments