Posted: 12/20/2008 9:58:37 AM EDT
| something tells me its just where you want it type of thing but before I mount it and sight it in I thought I would ask. Is there a better spot than others to mount a laser say like the side or bottom? |
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That depends on how you plan to activate it. If you have a remote pressure switch you can mount your beamz (yo!) on either side of the rail. If your beamz (yo!) only have a solidly mounted switch then you're going to be somewhat more limited on placement. Might wanna wait and mount the beamz (yo!) along with a vertical foregrip.
Basically it's up to you. Obviously mounting it directly behind the front sight post won't be very useful. 
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True Story:
Gun Show Overland Park. Had an M4 setup with MILES on the table and a pair of "Out of Towners" come by. BaNo spoke to them a bit, one of them knocks on the top of my MICH and says "That sound bulletproof yo" the other picks up the M4 and looks it over, lays it back down and points at the MILES SAT and says to BaNo "Is dat the night beamer yo?" I almost lost it... BaNo tried to splain it to him but I don't think BaNo Speaks Jive.... |
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I've got a unimax on the top FF rail on a 9mm AR. Keep in mind, once you sight it in for a certain range, the viewed laser dot will change and not match up w/your irons, red dot, EOThingy, etc, for other distances. My 9mm AR also has an Eotech. They are both sighted in for 25yards (indoor range). At any other distance, the red dot of the lazer does not match up w/the Eotech and the view can get cluttered. Since the Unimax is mounted in the vertical plane(above or below the barrel), the difference will be vertical, ie, the viewed eotech circle and the laser dot will start to visually seperate vertically, if both are on. If you mount a laser on the left or right rail. You can sight it in for XX distance, but then your viewed dot will start to seperate from your primary sighting too (irons, Eotech, etc) in the horizontal plane (left and right).
It's severe overkill on my indoor 25yard 9mm rifle but it's just as fun to turn off the eotech and just use the visible laser. scottMO |
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I'd mount it at the 6 o'clock position on your rail. That's where I had mine. As scottMO has said. You will have to zero it for a specific range. Your dot will go up as your range increases if you mount it at 6 o'clock. I figured the elevation guessing was quicker than the windage would be.
I had one of the Laserdevices (THIS ONE). I mounted it at the 6 o'clock position on the rail. It was a very good bright laser. I had it zeroed for 25 yards (indoor stuff) on my SBR, and had the EOTECH zeroed for 100 yds. This laser was really bright, and the range was incredible. I could see that laser at night as far as I could see. I don't think it was the best choice for what I was using it for. It got old for me, and I ended up selling it to my father for $20. He was going to spend like $50 on another laser. I figured it would get old for him after a while, like it did me. I didn't want him to throw his money away. I guess some like them, and have a specific purpose for them. I kind of lost interest in mine. |
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Quoted:
ok so if my little brain understands this rite I can zero the laser at a given range but thats the only point that it will be usefull? Yes and no, the laser is mounted alongside the barrel forming one side of a triangle. if you sight it in at 25 meters for example, POA/POI then at 50 M it will be shooting low by probably 2" then at 75 probably 4" then at 100 probably 8" presuming that you mount the laser on the bottom of the barrel, the further from the centerline of the bore it gets the larger your error will be at distant ranges. The opposite is true if you zero at 100 then the error will be high as you get closer. Geometry or Trigonometry should clear this up.... the Laser LOS intersects the bullet path at one point your point of aim point of impact, the bullet will continue to travel in an ARC but for our purposes here lets assume a straight line, the laser will continue to project in a straight line as well from that point of intersect. The Laser continues in that direction to infinite and beyond, the bullet presuming no drop continues on its way and the two never again intersect. In reality the bullet and the laser continue in their directions but the bullet slowly ebs further away from the POI/POA again never again intersecting with the laser. Convergence and Divergence. All that said I would mount the thing on the bottom. error in the vertical is more predictable than error in the horizontal. |
| ok what is POA and POI and while we are at it what is MOA? Does the 223 shoot flat out to say 100 yards or is there a rise to it? Can I assume that a EOtech would be the same? Sight it in at 100 then anything closer would be shooting high? I really would have thought if I sighted in anywhere from 25 to 100 yards it would be the same and I would make a small adjustment for anything over 100. |
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Quoted:
ok what is POA and POI and while we are at it what is MOA? Does the 223 shoot flat out to say 100 yards or is there a rise to it? Can I assume that a EOtech would be the same? Sight it in at 100 then anything closer would be shooting high? I really would have thought if I sighted in anywhere from 25 to 100 yards it would be the same and I would make a small adjustment for anything over 100. Oh boy.... POA= Point of Aim POI= Point of Impact MOA=Minutes of angle, again MATH... 1 Minute of Angle, subtends 1" and 100 Yards. No bullet "rises" Gravity takes hold of the bullet the moment it exits the muzzle and it begins pulling it back to earth, the bullet is not climbing or rising it is falling from the moment it leaves the muzzle, but if you look at the sights on the AR and figure they are roughly 2.25" above the axis of the bore then the Triangle will have the bullet intersection with the Line of sight at 25 Meters (if sighted in correctly) the bullet will still be in ballistic flight not rising but ballistically projected UP in relation to the Line of Sight. it will eventually use up a lot of its energy and start to fall back to earth, the path of the bullet is an arc but the intersection of the LOS, and Path of the bullet is the Point of impact and when sighted in correctly this will also be the point of aim. the path of the bullet in a 5.56mm round is pretty flat out to 100 but by 250 it is dropping through the line of sight of the sights again so it is more or less dead on at 250 yds as well as 25 yds. but then it is dropping pretty fast. So if you sight your EO thingy in at 100 yards, the bullet will be hitting low at any point closer than 100 yards. pretty much 2" low at 0-25 and mathematics will tell us where it will be all the way out there to 100 yards. but yes it will be Lower than your point of aim. Maybe negligably but it will be lower. |
| ok I get what your saying now. Lets say I have a EOthing a laser and my BUIS. They can all be dead on at 100 m but the view from each sight will be different in relation to the bore centerline. Where I can see my laser dot on center and then use the BUIS they wont line up. I will have to sight in each type of sight on its own. I did guess the POA and POI rite but I had no freaking clue what MOA was. |
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Not trying to hijack this thread.... but does anyone have a laser/light combo mounted on their rifle?
I found a great deal on a M6X. I have a Glock 23 that I'm sure it will fit on, but I would like to find something that I can use for my AR and Glock. Thoughts, suggestions? PS Thanks for the MOA, POI, POA info... It always seems to get a little fuzzy after a while 
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