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Posted: 2/25/2016 9:38:56 AM EDT
| In rifle class yesterday...it was mentioned that the barrel is angled up 5 degrees from line of sight. I knew about the upward angle but not the exact amount. Anyway, my question is, where does the angle come from? Is it the front of the upper receiver cut at an angle or is the barrel/barrel extension manufactured with the angle built in? |
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Quoted:
In rifle class yesterday...it was mentioned that the barrel is angled up 5 degrees from line of sight. I knew about the upward angle but not the exact amount. Anyway, my question is, where does the angle come from? Is it the front of the upper receiver cut at an angle or is the barrel/barrel extension manufactured with the angle built in? Technically, the barrel isn't angled up. During the zeroing process, we angle the sights down. This causes us to point the barrel slightly inclined so that the line of bore is pointed up, reference our line of sight and the bullet drop from the line of bore meets our line of sight at the desired zero distance. The angle to which your line of bore will vary from firearm to firearm, depending on the zero distance, muzzle velocity, and bullet characteristics. |
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On an AR-15 the difference between the bore and the sights is a nominal 2.6". This has to be taken into consideration when zeroing a rifle. If you sight the rifle in to be dead center at 25 yards the rifle will actually cross zero again somewhere past 300 yards.
I zero every high power rifle I own at 200 yards. The only exception being lever actions and 7.62x39mm rifles, both of which drop too much to be zeroed past 100 yards IMO. |
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Quoted:
Technically, the barrel isn't angled up. During the zeroing process, we angle the sights down. This causes us to point the barrel slightly inclined so that the line of bore is pointed up, reference our line of sight and the bullet drop from the line of bore meets our line of sight at the desired zero distance. The angle to which your line of bore will vary from firearm to firearm, depending on the zero distance, muzzle velocity, and bullet characteristics. Quoted:
Quoted:
In rifle class yesterday...it was mentioned that the barrel is angled up 5 degrees from line of sight. I knew about the upward angle but not the exact amount. Anyway, my question is, where does the angle come from? Is it the front of the upper receiver cut at an angle or is the barrel/barrel extension manufactured with the angle built in? Technically, the barrel isn't angled up. During the zeroing process, we angle the sights down. This causes us to point the barrel slightly inclined so that the line of bore is pointed up, reference our line of sight and the bullet drop from the line of bore meets our line of sight at the desired zero distance. The angle to which your line of bore will vary from firearm to firearm, depending on the zero distance, muzzle velocity, and bullet characteristics. Now that you said this, I think I already knew it. |
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Quoted:
In rifle class yesterday...it was mentioned that the barrel is angled up 5 degrees from line of sight. Not really. For an AR-15 with a 20" barrel and iron sights firing M855, the barrel will be elevated 4.339 Minutes Of Angle when the bullets exits the muzzle, for a 100 yard zero. For a 200 yard zero, the barrel will be elevated 5.248 MOA. For a 300 yard zero, the barrel will be elevated 7.344 MOA. .... |
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