User Panel
User Panel
User Panel
|
Posted: 1/9/2003 1:26:51 PM EDT
[#1]
Depends on how much you like your current cheekweld. Putting the ACOG 1/2" higher is going to make it harder to find if your gun mounting memory is firmly imprinted.
However, as you have observed, operators are using ACOGs mounted on top of rails that put them that high every day. It is possible and it will work. Consider that they are also concerned with, and training for, situations where they will likely be suited up in full NBC gear, and their learned cheek weld is going to be a distant memory anyway. Try the ACOG up high. If you don't like it, get a full face respirator (or a Simunitions helmet) and try it that way. The training may come in handy some day! Paul [url]mstn.biz[/url] |
|
|
|
Posted: 1/9/2003 6:27:33 PM EDT
[#2]
I have a SIR with ACOG mounted on my Bushy. I used the ARMS #19 ACOG mount. I also have the ARMS #40 BUIS installed. I like the setup and don't have any problems with the slightly higher cheekweld. If you do get the SIR, make sure you get the ARMS #40. It fits perfectly on the flatop of the rifle with the SIR butting up against it.
|
|
|
|
Posted: 1/9/2003 6:48:00 PM EDT
[#3]
The ACOG mounted and issued in the SOP MOD kit, mounted in the issue carry handle is higher that when mounted on the SIR. When the ACOG is mounted via the throw levers on the SIR, it is about 3/8" lower than when in the carry handle. How anyone can think it might be too high on the SIR hasn't been familiarized what has been optimum and issue, or to the fact that optics for military operation are better utilized better up than way down low./ Just look at the hts. used by US, Russian, German, IDF, Canadian, troops, etc. of scopes measured off the center line of the bore. THe Ht. of the SIR puts the optics at optimun ht. and alsop allows a more stable platform as it allows you to use lower more stable rings, than coming off the naked flat top.
Good Shootin, Jack |
|
|
|
Posted: 1/9/2003 7:49:50 PM EDT
[#4]
OTHER THAN WHEN WEARING GEAR THAT REQUIRES A HIGHER THAN NORMAL CHEEK WELD DUE TO SPECIALIZED GEAR AS PAUL MENTIONED ABOVE, ONE SHOULD STRIVE FOR KEEPING THE SIGHTS AS CLOSE TO THE AXIS OF THE BORE AS POSSIBLE, GIVEN THE CONSTRAINTS OF THE DESIGN OF THE HUMAN HEAD.
WHEN FABRIQUE NATIONALE DESIGNED THE G-I FAL, AN ERGONOMIC MASTERPIECE, FOR THE WEST GERMANS, THE KRAUTS SAID: "NICE RIFLE, YOU PUSSIES. NOW MAKE THE SIGHTS HALF A CENTIMETER LOWER, BEFORE WE OVERRUN YOUR MILK TOAST COUNTRY AGAIN!" OK, OK, MAYBE THAT'S NOT QUITE HOW IT WENT, BUT THAT'S WHAT THE GERMANS WERE THINKING, ANYWAY, I'LL WAGER. WHY DID THE GERMANS WANT TO HAVE THE SIGHTS AS LOW AS POSSIBLE? BECAUSE... THE LOWER THE MARK I MOD 0 SNOT LOCKER (HEAD) IS IN RELATION TO THE AXIS OF THE BORE WHEN SHOOTING, THE LESS OF THE BRAIN HOUSING GROUP (HEAD) EXPOSED TO INCOMING FIRE. A HALF A CENTIMETER, ABOUT 3/16 OR 0.19 OF AN INCH, CAN MEAN THE DIFFERENCE BETWEEN A HIT AND A MISS, OR A WOUND AND A KILL. WES GRANT [MSTN.BIZ[/URL] |
|
|
|
Posted: 1/10/2003 1:03:39 PM EDT
[#5]
I'm by no means an expert on this topic, but what about height-above-bore? For any of the ACOG series w/ ranging reticles, height-above-bore can really become an issue as the distance to target increases. According to Trijicon, the scopes are calibrated for certain heights-above-bore.
Take the NSN, for example. It's calibrated for mount directly on the M4 flattop. What does the SIR do to that calibration? Same for TA11, TA31, both of which (according to Trijicon) are calibrated for height-above-bore when mounted on a standard A2 carry handle. I'd love to see the ballistic comparison for various heights-above-bore w/ the ACOG scopes. For those tech-minded guys w/ lots of time, it's a good extra credit project. Make particular note of POI beyond 200 meters. FWIW |
|
|
|
Posted: 1/10/2003 3:48:52 PM EDT
[#6]
bore height should be a BDC issue.
height above the bore axis has the most to do with shot dispersion (closer the sights are to the bore- the closer your shots will be at all ranges to the target {IE shoot a M-4 at 3ft and then shoot a enfield bolt gun at 3 ft (the M-4 will hit about 2 inches low while the enfield will be less than half of that. THIS IS MAGNIFIED when the sights are mounted on the carry handle as TILTING then becomes a serious issue [shoot this setup on an accurate Ar halfhazardly and you will see half-moon groups appear on the target. |
|
|
Win a FREE Membership!
Sign up for the ARFCOM weekly newsletter and be entered to win a free ARFCOM membership. One new winner* is announced every week!
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 subscribers.
AR15.COM is the world's largest firearm community and is a gathering place for firearm enthusiasts of all types.
From hunters and military members, to competition shooters and general firearm enthusiasts, we welcome anyone who values and respects the way of the firearm.
Subscribe to our monthly Newsletter to receive firearm news, product discounts from your favorite Industry Partners, and more.
Copyright © 1996-2024 AR15.COM LLC. All Rights Reserved.
Any use of this content without express written consent is prohibited.
AR15.Com reserves the right to overwrite or replace any affiliate, commercial, or monetizable links, posted by users, with our own.
