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Posted: 6/16/2006 4:15:56 PM EDT
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Here is my problem- I can't get close enough to my TA442 to get a comfortable eye-relief w/o shortening my stock to an uncomfortable length. Are there any any other mounting options to move my acog rearward (an inch or so would do it), while keeping my ARMS rear-sight? Are there any flip-up rear sights that I could mount in front of my ARMS mount? Any other suggestions? Here is what I have- Compact ACOG (TA442) LaRue QD mount ARMS #05 mount ARMS #40 A2 rear sight Thanks!  OVERVIEW-  Rear sight up-  Rear sight down-  |
Your ACOG sits way to high, unless you have a very big head.  Actually, it is probably close to the height it would be for a fixed carry handle.Take off the ARMS #40A2 and ARMS #5 mount. Get yourself either an ARMS #40L or Troy BUIS. Looks like these should fit under your compact ACOG w/Larue mount. Since I no longer own a compact ACOG and Larue mount, I can't say for sure. The #40L base will take up the same footprint on the rail, but now that the BUIS will sit lower, you may be able to move you ACOG one slot further back. The Troy uses slightly less space, maybe enough to get your ACOG where you want it. See these (courtesy of CSGW):  
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You're right FALbert, it does sit high. It is the same height as if mounted on a carry-handle, which allows the use of the flip-up rear sight below it. If I mount it w/o the riser it does allow me to move the acog back about 1/4-1/2", which is better than nothing (pics below). But, the acog co-witnessing with the front post just seems to distract and bug me...maybe that is something I can get used to, or remove the fixed front post with a flip-up. Thanks for the input!  
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i agree, compact acog's don't belong behind a standard FSB. the FSB image is just a littel too much to deal with. you could install a PRI front flip up sight and that would allow you to mount the scope lower and not have the FSB interferance. i did something similar on my carbine, i use a troy front flip on a rifle length FF RAS. i cut the FSB down to fit under the rail. |
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I have my TA-50 mounted on a LeRue, with ARMS #40 BUIS. The front post is not a problem for me, although I haven't shot with my ACOG mounted on the rail yet. The front post is a blury verticle blob that I have to focus on to see. It's no biggie for me. Great looking rifle BTW. You have fine taste sir. 
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I've got basically the same set up minus the riser with a YHM flip front. I got an OK sight picture with a nose to charging handle cheek weld and moving the stock in one position form normal.  I still wasn't 100% happy with the eye relief, so I moved the rear to the handgaurd rail. This allows the optic to be mounted all the way back and I get a very clean sight picture through it with the stock in the most comfortable position for me. The only draw back is that the distance between the sights is signifigantly shorter, so it's a bit less accurate with irons for 0-100 it works just fine though. On the flip side I get more periphial vision when using the irons so transitions are a bit faster Not a convetional solution to your problem but it works for me.   |
 TA31F on the stock ACOG mount (since replaced by a GGG QD unit), ARMS 40 rear sight, PRI fron gas block/sight. I put my nose on the charging handle, this set-up works great for me. Why would you want to use the BUIS with the ACOG still mounted? The only time you would need to go to the BUIS is if the ACOG was messed up, and if it were you would remove and toss the ACOG and continue on with the BUIS. 
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A couple of things: 1) Forget about the back up site, if you need it close then attach it in front of the scope. You will never be in a position where will have to use them together and your scope will probably never break either. 2) Get ride of the riser, you are creating more problems than you are solving. You may as well throw away the LaRue mount because it is wasted mounting on that riser. 3) Use the scope more and you will forget about the front sight base. |
Thanks ian187 and everyone else, my questions have been answered. Here is my final sight config(the vertical forward grip I'm toying with, but I haven't made a decision on it yet). I'm sure that is worth another post entirely! Thanks for all the input.  
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I know what you mean. It is a pretty short sight radius with it mounted that far forward, but...it is a backup, can be moved, and does allow me to move my acog far enough to the rear to feel comfortable. With the hardware I've got right now, this seems to be a good setup. Thanks.
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Do you still have the carry handle (I am assuming one came with your rifle)? If so, just mount the Compact on the carry handle, that way you will have instant irons if need be and the FS wont be in your way. And if the eye relief is still too short, then drill a hole in the carry handle and move it back some, it won't affect anything. Compacts were made to mount to the carry handle. |
+1 I'm using a TA47-2 in the Larue compact acount mount. the lug on the bottum ogf the Larue mount sits in the third rail slot from the rear. An ARMS 40A fits under the ACOG just fine. Yes the top of the sight touches the ACOG under spring pressure, but it doesnt effect POI. |
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