Friday, December 28, 2012

Praxis: How to Zero your AR15 / M4 / M16A2 Platform: Mechanical Zero & the 25m Target

For all those black rifle newbies out there: How to Zero your AR15 / M4 / M16A2 Platform: Mechanical Zero & the 25m Target


CowboyDan said...

Good vid.

I have to sight in a rifle or two, and now I know how. I don't have official M16A2 targets, but I draw lines on paper pretty well.

I'll make good things happen.

Thanks, Mike.

Anonymous said...

This process is covered in depth on the first day of every Appleseed. The rest of the day-and-a-half program is well worth your time as well. Anyone with a new rifle should go to one.

A rifleman should be able to put 20 rounds into the black at 500 yards in under a minute. Thats an aimed shot every 3 seconds. Most of us (myself included) fall short of that. In fact, at the average Appleseed, 70% - 80% can't dependably do it at 100 yards on the first skill assessment target fired on saturday morning. Appleseed has seen brand new shooters earn their rifleman badge in a day and a half of intensive instruction. Their method works! Everyone who attends gets in depth knowledge of the skills they need to practice to achieve that goal plus a firm understand of the events of April 19, 1775 and what our British colonist ancestors did that day to start our country on the road to independence. As a bonus, you will get all the paperwork you need to order rifles and ammo from ODCMP.

I guarantee it will be the hardest, loudest, most fun day-and-a-half you have ever spent, with or without your clothes on. ;-)

Anonymous said...

The 25M (82') zero doesn't usually equate like they say though at 100 yards much less beyond.

What I'd recommend is zero at 50 yards and then see where the different bullet weights hit at various ranges.


Anonymous said...

Anon, the battle site zero for the M-16A1 ( the original design ) is 250 meters. When you zero at 25 meters you will be on at 250. From 50 to 400 you just use a modified site picture for you aim. If you want MOA shooting, then get a ballistics chart and some good glass and adjust accordingly.


Anonymous said...

The distance between the front & rear sight is different from the M-16 and the M-4. When I went thru basic in 1971 all we had were M-16's and I learned that as the bullet left the barrel the bullet would rise and later it would fall. On the upward trajectory it would go thru the line of sight at 25 meters and would go thru the same line of sight at 250 meters. While the bullet would rise and than fall, the line of sight is a true straight line. The distance between front and rear sights on an M-4 is shorter than the M-16 so the same formula DOES NOT WORK for the 25 & 250 meter formula. I have yet to see an exact formula for the difference is sight distance but I have learned something from ballistic charts, I have in my collection 8mm Mauser, 308, 30-06 and others. The weight of the 8mm gives it double the bullet drop at long ranges than the 30-06.
The longer the barrel gives a higher muzzle velocity due to more burn time for the powder therefore less bullet drop at longer ranges. It is not a "one size fits all" formula and sight spacing does make a difference. Friend of mine from Mechanical Engineering school had a project to calculate the muzzle velocity of a 357 with different barrel lengths. Quite a difference even at one inch increments in barrel length. To sum it up, Long Barrel, accurate vs Short Barrel, bullet hose. Either way I would rather be out of range of the enemy (aka Enema) than within his range. Just my 2 cents worth. Either way, Practice, practice, practice. If you can hit the target time & time again it is OK. Like the Boy Scout Motto, BE PREPARED and stockpile ammo.

Anonymous said...

Didn't have time to watch the video, but I thought I'd mention the Revised Improved Battlesight Zero (RIBZ), which is the Improved Battlesight Zero (IBSZ) with the addition of a 100 yd setting. Definitely good stuff. I zeroed at 50 yds with RIBZ for a high-power shoot (last minute prep...) and it was on for elevation at 200 yds (although I had to adjust windage slightly at distance). Learn it, love it, live it. Just don't forget that the number of clicks should be doubled if you have the 6/3 rear sight on a detachable carry handle. ::G