AR Sponsor
Posted: 10/20/2008 2:32:36 PM EDT
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I have a Bushmaster Patrolman's Carbine and I recently put a NIkon 3-9X40 mounted on a LaRue Tactical SPR-M4 mount. I have one of those LaserLyte laser bore sighters you slide in the end of the barrel and twist tight. Also, my carbine has a Birdcage muzzle device. NOW TO MY QUESTION: Do I just slide the laser bore sighter all the way in then twist it tight? I know this may sound dumb but i didn't know if the bore sighter touching the muzzle device would hurt the accuracy or effectiveness of the bore sighter? I also realize that bore sighting is just to get me close and on the "paper" however my brother has an identical AR however with a different type of muzzle device and we bore sighted it and it was dead on from then on. THanks for any help or advice. |
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Hmmm...I've always just taken the upper off the lower, placed it in a rest and sighted down the bore onto the target. Then moved the scope crosshairs to the same target point. Using a lazer seems a bit complicated for an AR, but then again..maybe my method is harder. |
That's how I do it. Gets me on the paper at 50 yards. ZM |
| you can just slide it in and twist like a normal rifle, just don't ram it in there..... and i have found that some bore sights that go in the end of the BBL don't always work with the AR, cause of the Flash hider/compensator, just doesn't sit in there 100% right, but if it worked on your brothers AR, then you should be GTG |
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Thanks for the comments. GOing shooting tomorrow and was just curious on the consensus. Also any suggestions to ensure the crosshairs are perfectly level? I have heard that doesn't matter because its all in how a person holds the rifle and its different for everybody but then again i have heard that the crosshairs must be perfectly level with the gun to ensure the best accuracy. Any advice or help with this issue as well. |
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I put my upper in it's Panther Claw and stick it in the vise. Use a couple of levels to get the upper where it needs to be, then stick on the mount and level the scope on the turrets. I've also used the feeler gauge method if the mount and scope have enough flat surfaces. |
I used an optical boresighter and was crazy accurate. I had the leupold... waste of money to buy. Try to find someone's to borrow like a smith. I have a ADM mount on a flat top so you set the boresighter to 2.7" and 2" high for 100 yards and shibam.... the paper dies
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Level with the gun is less important than level when you shoot. Ideally, the center of the scope would be directly above the center of the bore and would be leveled there. That may or may not mean leveled with the rail it's mounted to (rings could hold scope to one side or the other etc..). I lightly tighten the ring screws, then rotate the scope so that it's level when I aim the rifle most comfortably. Again, just make sure the crosshair is level when you shoot, especially if you shoot at longer ranges and have to make elevation adjustments. |
| I use the bore lasers that you chamber - they direct the laser beam right down the barrel. You don't have to hold the rifle still or put it in a rest. Just point it at an object at the zero distance (50 yards is good) and adjust the reticle to cover the laser point. You're done. Naturally you would fire a few rounds to verify sighting since this method does not account for the trajectory of the bullet, but you're basically on the target. I used one of the lasers once like the OP is talking about that sticks in the muzzle. I had a muzzle brake on the rifle and it didn't come out right. I thought I had it in there straight and adjusted the scope to the dot at the appropriate range (33 yards in this case), but when I live-fired I was way low. Obviously the laser was not lined up right because of the brake. That's why I picked up a chamber laser with a couple different mandrels (.223 and 7.62x54, the only 'scoped rifles I have right now). |
thats how I do it. those laser bore sights never work in my exp. just look through tthe upper and barrel while its held tight. center the bore on a red dot about 25 yards away and adj the scope untill its on the dot. it will be clkose enough to start to zero more precise at 50 yards or so. its fairly fast |
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