Dead batteries, LaRue, and M4 zeroing.

I went on a trip to Michigan recently.  During this trip I ended up using my hand held light for 40 minutes one night.  It still boggles my mind that some people feel it is not necessary to carry a flash light, however that is beside the point.  This use drained the battery in my light, so in the morning I went to replace the battery.  Turns out both Panasonic brand batteries I bought with me as backups were dead.

So from now on I am going to check my spare batteries before I pack them.

LaRue has announced an upcoming price increase.  At the 1st of next month prices will jump 7.5 to 12.5%.  While I understand that prices will change, and that change is normally upwards, it saddens me to hear of this.  I already know to many people who have bought far inferior gear just to save a few dollars.  I hope that this increase in price won’t discourage new buyers from buying LaRue products.  If you were planning a purchase from LaRue, might as well try and get it in before the price increase.

Yards vs. Meters.  Turns out there really is a difference.  In the USMC we often used the two terms interchangeably.  However yards are not the same as meters.  Currently the Army uses a 300 meter zero on their M4 carbines. This is accomplished by firing point of aim (POA) point of impact (POI) at 25 meters with M855 ammunition.   This puts the round about 7 inches over POA at 175 meters, and 7 inches low at 350 meters.

Zeroing at 300 yards with the same ammo gives you a max hight of 5 inches over the point of aim (at around 175 yards), then the round drops to 5 inches below point of aim at 350 yards.  However at 350 meters the round is about 9 inches below point of aim.  I have not double checked the numbers yet, but it looks to me that the distance numbers on the detachable 6/3 carry handle for the M4 are a better match if you are shooting in yards instead of meters.

For many civilians, the 300 yard zero may be more practical then the 300 meter zero due to the flatter flight path under 300 yards.  Most ranges are measured out in yards, so a reduced 300 yard zero could be had by having your impacts 1/2 inch low at 25 yards or 1 inch high at 50 yards using your 300 yard sight setting.  As always, when possible confirm your zero at distance.

One last thing, please don’t try to get a 300 METER zero by shooting at 25 YARDs.  This is closer to a 350 meter zero, and puts your rounds about 10 inches high at 200 meters.  If you want a 300 meter zero on the M4, shoot at 25 meters.

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