5 for the Eotech/Unity. The sight height of your rifle is needed to calculate your ballistics accurately. 215 centerline of bore to top of rail. PHOTO below: A picture speaks a thousand words :D A 'No-Brainer' :rolleyes: My Sierra Infinity Can anyone tell me the sight height over bore for a standard detachable carry handle sight 6/3 Win a FREE Membership! Sign up for the ARFCOM weekly newsletter and be entered to win a free MUZZLE awareness, and HEIGHT over BORE professionalism. - Just slide the BC back. 75" from center of bore to center of scope tube. Most AR15 rifles with standard height optics will be about 2. I have bolt diameter divided by 2 I have scope tube diameter divided by 2 Now for the distance “top of bolt in rifle to bottom of scope”. However, I'm curious. Is there any resource that illustrates how much it's altered based on how much It’s more like 3. Determine the optic Centerline: Measure the How do I measure the height over bore on my AR-15? You can measure HAB by using a ruler or calipers to measure the distance from the top of the receiver to the center of the optic or What is Your Method for Measuring Scope Height? I have a few techniques for measuring scope height for use in a range finder/ballistic calculator. Height over bore, or sight height, is the difference in height between the Okay so I know this isn’t a real ar15 but this question is pertaining to the height over bore for scopes on an ar15 pattern rifle. Follow these steps to measure the HOB for an AR-15: Find the centerline of your bore. 93" over the rail. 44" I'm using these numbers AR15 sight height at 2. Welcome to r/AR15! Share you builds, ask relevant questions, play nice etc. Have to remember that when your up close but I find the bottom Mechanical offset (or sight height over bore) is the reason your rifle seems to shoot low at closer distance. This post shows how to determine your AR15 height over bore, or sight height, to be used in a ballistic calculator. 5″ sight height when your scope is truly 1. 26" - The Best AR-15 Optic Height? | 9-Hole Reviews The chart below will help you determine the Height Over Bore when using our AD-Delta-C Scope Mount with our UIC-15 and UIC-10A Rifles. This is information you'll want to know when submitting yo How do you measure sight height over bore for use in a ballistic calculator? Is it measured from the center axis of the barrel to the center axis of the sight? I tried measuring my Vortex PST 1-4X that is The nearby graph shows how to determine the height over bore, or sight height, of your AR15 / M4 to be used in a ballistic calculator. Height over bore, or sight height, is the difference in height between the The height of the Picatinny rail of a weapon over the axis of the bore of the barrel is an important metric when it comes to choosing the correct optics mount height. (height over bore) How do you determine "height over bore" when using a red dot The height of the Picatinny rail of a weapon over the axis of the bore of the barrel is an important metric when it comes to choosing the correct optics mount height. Height over bore, or sight height, is the difference in height between the Learn how to measure scope height with precision. On a 20 rifle, you do not need an f marked sight. Sight height or height over bore is the distance Absolute co-witness is standard at 2. Place ideas for future videos in the comment section. 715 centerline bore to centerline scope. Get expert tips, guides, and tools to stay prepared for every mission If you do find yourself wanting a taller optic, keep in mind the taller you go with your optic, the greater your height over bore will be. You are not logged in or you do not have permission to access this page. Measure from the center of the scope to the center of the bore guide/cleaning rod. Iron sights are 1. 25” over the 30-yard change. It should be noted this rifle I have a few techniques for measuring scope height for use in a range finder/ballistic calculator. Let's In this video, we're going to show you how to easily measure the sight height of your rifle scope. e. 313K subscribers in the ar15 community. How do you measure sight height? I assume it's the center of the scope to the center of the rifle bore. The bore axis of a firearm is the longitudinal axis through the geometric center of the gun barrel. 26" - The Best AR-15 Optic Height? | 9-Hole Reviews Easy way to find out. In a rifled barrel, the projectile (bullet / ball, pellet or slug) will spin Height Over Bore Explained and Why an Elevated Red Dot Is Better Free Range American 88. This In this article, we will share with you the 3 methods of how to measure sight height, the formulas used for measuring scope height, the 6 tools used when mounting My rifle has a 40 moa mount and I have always determined bore height from the center of my front ring to the center of the chamber gas port. 5 Jared explains why it may seem like this because of the height of the optic over the bore of the rifle. 5". The dot centered in the tube will be 1. I’m measuring from the middle of the barrel to midline of the optic. 62” So 2. What does everyone else do to Was trying out a ballistics calculator to try and settle on a good factory load for my rifle and noticed that the sight height setting starts at 1. Repeat the process for any additional scope mounting positions The rifle with the greatest scope over bore difference (AR-15 at 2. Send gear to be reviewed to: Thanks to standardization with the M4 technical data package, the height over bore of a mil-spec AR15 can be quickly determined by adding a constant to your scope mount height. Measure the diameter of your barrel, then divide by two. While the bolt might not be shut, it doesn’t have to be for the laser to Some scope rings are measured from the top of the rail to the bottom of the ring. Not to You will receive an email every Friday morning featuring the latest chatter from the hottest topics, breaking news surrounding legislation, as well as exclusive deals only available to ARFCOM email 853 likes, 8 comments - koeng_co on October 13, 2023: "How to determine height over bore (or sight height) on a AR15 / M4 based rig for use in ballistic calculators. Height over Bore Calculation for Piggy Back RMR in 1. 2. Fortunately, this measurement Key Takeaways The correct sight height measurement will help you remain comfortable as you shoot. That puts it ~3" over bore. Use code YOUTUBE10 for 10% off your next Steel Target order: The height over bore concept introduces a dynamic element into the world of rifle optics, influencing shooting stance, field of view, and shot placement. 42" (Sight height over rail) = top of rail height over bore of 1. 93" vs 2. If you lower the A2 rear sight to the bottom (mechanical zero), what is the height over bore (HOB) of the large aperture and the small aperture? Thanks for any help Just downloaded Hornady 4DOF and was putting in my rifle specs, got to sight height over bore and realized I needed the measurement from bore centerline to top of pic rail. Height over bore is “sight height” Discover how to measure rifle scope height with Crate Club—your ultimate source for premium tactical, survival, and self-defense gear. I have both. , if your red dot is using a 1. 5" over bore and 1. Does anyone have the exact measurement of the distance between the top of the integral rail on the receiver and the centerline of the bore? Sam demonstrates easy ways to check your scope's height for input intoa ballistic solver, and discusses why it's important. What is the actual measurment from the bore centerline to the top of the rail on a typical flat-top upper? I know the rail to bore centerline height of my scope mount, but I need to know the total bore centerline What is the actual measurment from the bore centerline to the top of the rail on a typical flat-top upper? I know the rail to bore centerline height of my scope mount, but I need to know the total bore centerline Learn how to measure the height over bore, or sight height, of your ar15 / m4 rifle for ballistic calculations. 2" on the AR10) Could this be right? Measure the distance between the centers of the bolt-carrier and scope. How low can you go? That's the question Brownells Gun Techs Caleb Savant and Steve Ostrem answer today - in the context of mounting a rifle scope on your AR- What is the easiest way to get an accurate measurement of Bore to Scope height to get an accurate input for my Ballistic Calculator ? How accurate do you have to be ? They were not built for general use but due to copy cat mentality, many are putting them on for looks and to be in a fictitious “in club” without any regards to height over bore. 228 votes, 109 comments. Action is an Impact, I am beginning to understand that raising optics increases height over bore, and will alter a traditional zero (say the 50/200). true No. Shooters If A2 sights are 2. You How much does having a higher height over bore effect the BDC's accuracy on an ACOG? I have a TA31-RCO and was thinking of mounting it to my Springfield The issue is the dreaded HEIGHT OVER BORE. COM Posted by u/gagemoney - No votes and no comments How to measure your scope height? Our expert Spencer Steck, gives you an in depth guide on this essential measurement you will need. I’m having a HUGE brain fart right now and doubting my math for height over bore to put in my ballistic calculator. What does Depending on what gun you are measuring on, it's different. This could be due to one of several reasons: You are not logged in. Anybody know what the distance between the bore centerline and the top of the rail is on the Aero M5 uppers and/or the Armalite AR10B? Yes, I have both types of rifles so I'm looking for the measurem What is the distance from bore center to rail on a flat top AR and then bore center to rail on STG/AXR There are some interesting front sights that mount on the barrel . 93, that is the centerline height of the optic. In order to zero my AK the same way the HOB would have to be When figuring out how to measure scope height, some simple formulas are generally enough, allowing you to mount your scope as low as possible while still preventing it from touching the barrel. He’s asking about height over bore, you guys are giving him your mount heights. Scope Height Calculator at Outdoor Discovery Scope height is a very important Height over bore is a term that is used to describe the difference between the two parallel axis, specifically the barrel of a rifle and the shooter’s line of sight through their optics or iron sights. 6 inches HOB. 3K subscribers Subscribed I have a S&W M&P AR-15 OR. Or how not to shoot your car. I alway measure if I`m wanting exact. Thanks to standardization with the OK. This article explains how to precisely calculate the height of your scope above the centerline of the rifle barrel bore. 6 inches height Other Things to Consider When Measuring Scope Height Sight height, also known as height over bore, is necessary to help calculate your scope ring center line in This measurement should be expressed in millimeters or inches, depending on the units you use. 5”) had a shot height variance of 3. Is this method (1) Exactly -the height over mounting surface for the 30mm Leupold - not sure how this is measured and is that the same thing as ring height? Top rail to the center Height above bore depends on height of rings and bases so it can vary a fair amount with a given scope on a given rifle. 18" Eotech EXPS You are viewing the article: How To Measure Scope Height: The Complete Guide. I’m measuring from optic center line to center of the bore (center of dust cover) and getting Most laser bore sights, including mine, turn on once the bolt is on the back of the bore sight. I am beginning to understand that raising optics increases height over bore, and will alter a traditional zero (say the 50/200). 54" vs 1. What Is Standard AR Sight Height? Standard AR iron sights set the aimpoint at exactly 2. Eta: near as I can tell the spec is closer to 1. 6″ over the bore, your calculations will be an inch off Scope Over Bore: What is it and Why Does it Matter "Scope over bore" refers to the vertical distance between the optical axis of a rifle's scope and the bore axis of The nearby graph shows how to determine the height over bore, or sight height, of your AR15 / M4 to be used in a ballistic calculator. 1" over bore on the AR15 (1. A carry handle mount and an In a more likely example, if you zero your rifle at 25 yards and enter 1. Is there any resource that illustrates how How to Measure Sight Height on an AR-15: A Comprehensive Guide Determining the correct sight height on your AR-15 is crucial for accurate ballistics calculations and effective shot placement. 93" Mount with ROF-90 > Optics, Mounts, and Sights > AR15. So in trying to find my height over bore or sight heigh, I have a question. Lay the upper on a flat surface with the rail down and measure from the surface to the center line of the barrel. Today we’re looking at why that matters and how to [ARCHIVED THREAD] - BUIS height for absolute co-witness 4/12/2018 8:09:51 PM EST 4/12/2018 9:00:22 PM EST [#1] Absolute Height With an absolute cowitness configuration, as pictured with the EOtech above, the center of the optic lines with the height of the iron sights. 8 inches, and that the IBSZ is calculated using that HOB. This is aterm to describe the distance beween the optic's center vs the rifle's bore line. Fill in the form at the bottom of this page and try again. OP, do you know your mount height? Anyone know offhand what the height over bore is? 3. For sight height or height over bore, my approach is to MUZZLE awareness, and HEIGHT over BORE professionalism. Most poeple don't know what's important or how to read what's there. This is important to get precise solutions from Measuring barrel diameter with my reloading calipers. Iron sights are 2. Using a flat top rifle receiver or scope bases and your work bench this video shows you how to measure iron sights for your rifle. How high up is too high up for a scope? Rail height of flatop receiver and other rifles The Art of the Rifle: General When using an optic/scope is the measured height over bore from center of objective lense to center of inside diameter of bore? When using isnipe ballistic app this is a question asked so Id like to be as © 2025 Google LLC One of the parameters for creating a ballistics elevation chart is the height of the sight above the center-line of the barrel. 1. Riton Optics - https://r He states that the height of the sight over the bore (HOB) for an AR is about 2. I use a 510C on a 1/2" mount and it good for a comfortable cheek weld. This is important to get precise solutions from ballistics calculator programs. 41” over the top of the rail, most "absolute co-witness" red dos and optics are ~1. 93″ mount, your height over bore will be You can literally look up typical height over bore for absolute cowitness and lower 1/3 cowitness which covers probably 95% of red dots on AR’s. Just measured. On an AR, you can find the height to the top of the rail on Google, then add your rings center height, usually find them online. For The nearby graph shows how to determine the height over bore, or sight height, of your AR15 / M4 to be used in a ballistic calculator. Our guide provides actionable methods for ballistic calculators and tactical rifle setups. 25 for the T2/scalarworks and 3. 4" over the rail (if I remember correctly), then top of the rail ought be 1. Considering sight off set on the AR platform. 6" (HOB) minus 1. When they say 1. Sight height, also known as height over bore, is necessary to help calculate your scope ring center line in setting up your rifle. 6" What is the sight height for a 20" AR15 using an F marked FSB and a carry handle rear sight on a standard flat-top upper? And how important is it to calculating drop at the various yardages. It is important to note that your height over bore is different from your mount height; i. There will also be less contact for Up front results: A taller mount means you can shoot farther without holdovers Close shots (<25m) will not be lower than your height over bore (HOB) Sifting throgh the AR-15 specs in an advertisement is difficult. Below is a formula to help you be a little more precise when determining sight height.

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