AR15 Zero Introduction

[LSUTiger]

I constantly see discussions of AR15 Zero distances, here's a good video and PDF presentation.

https://www.youtube.com/watch?v=Klvve0ZG_jo

PDF of this presentation:
http://gunwebsites.net/wp-content/uploa ... uction.pdf

Edit 8/31/15

For 16" barrels, M193 55gr and M855 62gr have very similar trajectories close enough to identical to use them interchangeably for practical use.

Also for you AK guys the AK-74 5.45x39 7N6 is supposed to have the same trajectory as the M855???

http://www.ar15.com/forums/t_3_18/51233 ... ories.html

http://www.akfiles.com/forums/showthread.php?t=108647

And for AR pistols/SBR at least 11.5" barrels, from my AR15.com interweb research indicates a 50yd zero recommended.

Also see article for barrel length/velocity.

http://www.thefirearmblog.com/blog/2014 ... c-methods/

[Eric Lamberson]

Very well done--particularly the hose pics.

[Beiruty]

I think 25yrd is too aggressive. 50yrs is more realistic. I wished he mentioned the MPBR for each zero case. With iron sights, 300-400 yrds are max for my eyes when shooting man-sized target.

[LSUTiger]

I think 25yrd is too aggressive. 50yrs is more realistic. I wished he mentioned the MPBR for each zero case. With iron sights, 300-400 yrds are max for my eyes when shooting man-sized target.

I think you could easily guesstimate MPBR for each zero from the info given. It's easier to review with the PDF file. It also depends on how much +/- is within your definition of MPBR. For me +/- 3" would be ideal, for a 50 yrd zero, 4" drop at 300, so I say 300 is MPBR at for 50 yd zero. At 400 just aim for the head and get to get a hit on the chest. On a silhouette target of course.

[Beiruty]

Where is the like Icon/button?

[android]

I like the 50 yard zero and set my EoTech for that.

I will probably be off more left/right than up/down due to bullet drop anyway.

It's a good tool to show that a COM shot at up to 200 yards will still hit pretty much COM.