|
||||||||||||||||||||||||||||||||||||||
Owner/Instructor at Semper Paratus Arms
Facebook: https://www.facebook.com/SemperParatusArms/
Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/
M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141
Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com
IG, how much is too much? I'm in similar shoes. My BCM upper appears to be canted slightly left. A Troy rear (which I no longer use) took 40 clicks but was still within the adjustment range. BCM (with typically awesome CS) offered to take a look for me but I'm not sure it's worth the trouble... it's my HD and farm rifle. Shots beyond 50 yds uncommon... beyond 100 unlikely. I can still hit minute-of-coyote at those ranges just fine and I otherwise love the shit out of that upper.
So for me and the OP... at what point should a cant make you stress out? If you're windage is off by "x" at 100 yards, for example?
Last edited by rackham1; 11-29-11 at 18:44.
If you are concerned about it send it in. If I think I think real hard when I BZO'd my issue M16A2 rifle, my rear sight was moved left about 9 clicks and my front sight post was down about 3.
Excessive to me would maxed out left or right and still not being able to get a good zero.
I also use a Troy front and rear sight. In this case I would put an A2 carry handle on the gun and then PROPERLY attempt to zero it.
Owner/Instructor at Semper Paratus Arms
Facebook: https://www.facebook.com/SemperParatusArms/
Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/
M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141
Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com
Gotcha, that's good advice. I guess what I getting at though is it's not the adjustment range that concerns me, but how far off the windage will be downrange from your zero. That's basically what a cant does, right? Zero at 50, then your windage is off at 100... or zero at 100, then your windage is off at 50... am I wrong?
For me, zero'd windage at 50 but 1-inch right at 100 is within my needs... no concerns for me. Just wondering what the rest of the group would consider acceptable for a HD rifle (understanding that long-range, competition, etc. are a different story).
Not IG, but excessive windage is defined in the last pages of the milspec, I'd have to go pull up my copy to get the verbiage though.
ETA:
The MIL-R-63997B (AR) Amendment 4 31JUL93 which covered the M16A2 at that time specifies that with the rear sight set +/- 5 clicks (0.5 MOA) from center all shots of a ten round group of M855, having a horizontal and vertical SD of between 3.4 and 4 inches at 600 yards, must fall into a roughly rectangular target 17.6" tall and 11.6" wide set at 100 yards.
http://www.ar15.com/content/manuals/m16a2milspec.pdf
the M4A1 JAN94 spec calls for +/- 12 clicks (0.68 MOA) with the same but at a 22" by 16" 100 yard target.
http://www.ar15.com/content/manuals/m4a1milspec.pdf
Last edited by Tweak; 11-29-11 at 21:56.
Owner/Instructor at Semper Paratus Arms
Facebook: https://www.facebook.com/SemperParatusArms/
Semper Paratus Arms AR15 Armorer Course http://www.semperparatusarms.com/cou...-registration/
M4C Misc. Training and Course Announcements- http://www.m4carbine.net/forumdisplay.php?f=141
Master Armorer/R&D at SIONICS Weapon Systems- http://sionicsweaponsystems.com
I didn't say it was excessive, I said the milspec defined excessive since it sounded like he wants a quantitative answer.
If it was my rifle, yes, that's excessive, I adjust mine as close to zero as possible.
Bookmarks