Recommend sights/mounts for flattop AR15?

Legionnaire

New member
I need to set up some sights on a flattop AR-15. I'm looking at the Aimpoint Comp-M, as well as the Trijicon Reflex (the ACOGs cost more than I want to spend). What are your experiences with these two sights? Pros/cons of each? Are there other "red dot" scopes in this price range I should be looking at? What about mounting systems? I see Trijicon makes their own. How about Aimpoint? What about the GG&G mount for the Comp-M? Again, what are the pros/cons of the various options?

Also, what are your recommendations for a flip-up/reserve rear sight? And finally, good on-line sources for any/all of the above? Thanks!
 
I prefer the Aimpoint......

Legionaire,

I have an Aimpoint Comp M XD and a Comp ML XD on my two flattop carbines. I've used the Trijicon Reflex and prefer the Aimpoint because the Aimpoint has a dot that is adjustable for intensity. I find that the Reflex tends to wash out in bright light. The polarizing filter also is supposed to cure this problem, but I'm not all that convinced. The Aimpoint uses batteries. Many people consider this a downside of the Aimpoint, because you have to remember to turn it on and you can run out of power at an inopportune moment, but when that happens you just replace the battery and you're back in business. When the tritium goes dim in your reflex you have to send the reflex back to the manufacturer for replacement. Then you are without a sight for days to weeks. The new diodes in the Comp M2s give amazing battery life. Aimpoint says you don't even have to turn the sight off any longer.

The Aimpoint is fairly indestructable. The Army uses thousands of them on M4s and M16A2s. It's fairly GI proof. The reflex doesn't have the same durability. I understand that they are being replaced in the SOPMOD kits for the M4A1 with Aimpoints. One of the reasons was that they didn't stand up to the abuse they received in military service. Probably not a concern as few of us would treat their weapons the way the military does. But then again, why take the chance.

Aimpoint makes it's own mount for the Comp M series. It's called the Railgrabber. It's a quick release/return to zero mount. Comes with a large thumbscrew that can't be overtightened. If you prefer a throwlever mount, try the A.R.M.S. #22M68. I have both of these mounts and consider them excellent. The G.G.G. Mount is also good and comes with a spare battery compartment, but it is more expensive then the other two mounts. Knight's Armament Company also makes two mounts for the Aimpoint, one that is straight and one that is offset and places the Aimpoint out over the handguards from the upper receiver.

There are a lot of backup iron sights out there. I personally have and use the Knight's 300 meter flip up sight and the A.R.M.S. #38 Swan Sleeve that flips up. The only thing I don't like about the A.R.M.S. #38 is that it doesn't lock in the UP position. I've never had any movement when it was up, it's probably just a quirk of mine that I'd like to hear it lock into position when I raise it.

Try Donnie at Sable Company for these items.

HTH

Jeff
 
Jeff,

Thanks for the info. Does the Aimpoint Railgrabber position the scope high enough for backup irons to be used without removal of the COMP M?
 
Legionnaire,

Yes, with the M4 spacer the Railgrabber will put the Aimpoint at just the right height to use the backup irons "through" the Aimpoint. The M4 spacer isn't really necessary for this application, but it does put the Aimpoint at the correct height to center the front sight in the FOV of the Aimpoint.

It's a very good setup. I have the KAC 300 meter backup on both of my carbines. I keep it in the UP position and if the Aimpoint were to fail, I just use the irons right through the Aimpoint. The Aimpoint has never failed, but I do practice using the irons that way.

Jeff
 
The coolest mount for the AR-15 is ...

the Colt/C-more Tactical sight. Note this is not the Scout sight which mounts to the carry handle and sits ontop of the handguard. The Tactical sight is for flattops; it is the c-more sight fixed to a base that includes a standard A2 rear sight. The geometry of the reddot sight is arranged so that the dot "witnesses" the iron sights. Properly sighted in, the front post should bisect the reddot.

You can also use the sight with your head slightly raised and have the dot float over the iron sights as it is parallax-free. This is a great position for moving targets or fast acquistion (like practicing on steel or bowling pins).

The iron sights are not backup, nothing to flip up - if the dot fails your iron sights are right there, right now.

Additionally, I like the c-more or holosights as they project a reddot without having to look through a tube. Some may say these are not as rugged as an Aimpoint, but they work for me. I don't go rock climbing or hiking in the field for weeks with my AR.

A very sanitary setup - clean and effective.
 
I have the OKO sight on my AR15.COM LEGP, and I find it's a very nice sight. I mounted a flip-up rear sight behind it, and it's a perfect back-up, you can sight right through the optical sight if it has a problem or a dead battery. The other thing I like about the OKO is it's as light as a feather. :)
 
I have a Aimpoint Comp M2. Pretty cool, I am happy with it. I have a fixed carry handle though, so I have it mounted out in front over the handguards on one of those gooseneck mounts. The railgrabber mount works pretty good. The knob that is used to tighten down the mount has a torque limiter on it so the mount should rezero well. Haven't played around with mine enough to see if it really works. However, I have noticed that taking it off an on, the red dot still lines up with the iron sights the same as far as I can tell. The only bad thing about the mount, is that the knob sticks out some due to the torque limiter. It's not enough to bother me though.

I am not sure about the other types or red dot/reflex sights, but the Aimpoint comes with scope covers. Obviously, this will protect the lenses and keep them from getting dirty. I think the other sights listed here don't really have any way to protect the optics from dirt and scratches.

As mentioned above, the M2's also have really good battery life. I believe the battery will last for a year with the red dot continuously on its brightest setting and 10 years on it lowest setting.

Another place to check, if you haven't already, is the optics section of the AR15.com forums. There is a lot of info over there.

One last thing, if you ever find yourself with $3000 to burn, the Comp M2 is night vision compatible. Just need to buy a AN/PVS 14 and your ready to go.
 
Trijicon Reflex, polarizing filter opened.
openfilter.jpg



Trijicon Reflex, polarizing filter closed.
closedfilter.jpg





Basically the Reflex will become an OEG(occlued eye gunsight) if you're using the polarizing filter with it closed completely.



Yes, if you do not use a polarizing filter the dot is not very intense and will likely wash out when using during bright sunny days or against light colored objects. Putting the polarizing filter on and leaving it open adds a bit of contrast that helps use the sight in about 80% of all situations you'll encounter and closing down the polarazing filter or adjusting it isn't needed all that often unless you're really wanting to see that dot. The camera had a bit of a problem seeing the dot and I'm gonna try retaking the pictures to get more realistic results that reflect what I've seen as a shooter, will try taking outdoor pictures if that's what it takes.

During the day time turning the polarizing filter so it's closed almost literally makes that dot "jump out" right at you, just last monday I was drilling the 10-12 inch steel plates all the way out to 300 yards with my 4.3MOA NSN Reflex.



I've seen the triangle reticles on the Reflex 2 and they do impress me a bit, something interesting that a member over at AR15.com had done was he ordered a special Reflex2 with the triangle reticle installed upside down. His reason for this was that he had zero'd the sight so that 300 yard zero was right at the bottom point of the triangle making hold over MUCH more easy for shooting long ranges and so that closer ranges were just so simple as "plastering" that reticle right over the target.




One thing that I like about the Reflex is that it seems overly rugged, my Reflex has sustained a couple whacks after the AR15 has been dropped during transportation or some rather unintentional handling mistakes where it simply got dropped. The thing just kept on ticking and still hits on target. The only thing that worries me is if somehow I managed to catch the polarizing filter and give it a real stiff whack, it's thin aluminum housing my snap off and be left threaded into the sight. This stupid Reflex is simple and I really like it because of that, I was interested in the C-more systems sights but after a couple negative reviews I decided against it(reports of wandering zeros) and I also don't think a C-more would have survived some of the hits my Reflex has taken. While an Aimpoint is likely just as rugged as the Reflex I didn't like the idea of needing batteries not to mention I simply couldn't get a Aimpoint for as cheap as I got my reflex, at the time the Aimpoints were around 450-500 after purchasing the sight and one of the popular mounts where as my Reflex I purchased for 315 delivered with mount, dust cover, polarizing filter, and the sight.



Some people REALLY DISLIKE the colored tint of the Reflex but it doesn't bother me. In fact I really like the effect of the tint at night when used in conjunction with a tactical light, the effect is like a "super ghost ring" where the entire area in front of the muzzle is painted bright white by the tactical light and then there is the targeted area which is tented blue by the screen of the Reflex and then right there in the center a bright orange dot is leaping right out at you. The different contrasts really makes shooting just about as instinctual as it gets in my opinion.




One other thing of note, I do believe that the Reflex does have a MINOR amount of parrallax depending on how you use it. Really there's three ways to use it:sighting through with just one eye using it like a scope where you line up the dot with the primary sighting eye, using it with both eyes open and merging two target pictures at once while imposing the dot sight, and closing down the polarizing filter so that it's an OEG where one eye superimposes the dot image onto the image of the target viewed by the other eye. Sitting down at the bench and carefully shooting with the 3 different styles and watching what my groups did I could see small shifts at 100 yards between the 3, for a battle sight it's accurate enough and doesn't bother me in the least for shooting out to 300-400 yards. But for an action rifle match or a 3 gun match I'd only consider using the sight after careful evaluation of what type of targets and distances are to be expected, a scope with a bit of magnification and a more precise reticle is much better suited to that sort of shooting.


As for the Aimpoint, I do in fact believe their claims of a truely parallax free system. As for C-more, I'm not so certain because the Trijicon Reflex and the C-more really do work on a similar principle only one design uses ambient light(trijicon) while the other(C-more) uses artificial light emitting from a diode.
 
uglygun, thanks for the extensive comments, and the pics! I can always count of quality, experience-based advice from the denizens of TFL.

At this stage in the game, I'm leaning toward the new Aimpoint Comp ML2. Hope to make final decision next week.
 
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