AR Sponsor
Posted: 12/14/2008 3:29:00 PM EDT
|
Hey all,
I've decided for sure that I want go with an EOTech sight. But I have a few questions... Any help would be greatly appreciated. 1. What are the major differences between the different models of the EOTech sight? I have seen the 511, 512, 551, 552. 2. I have heard nothing but great things about LaRue Tactical, and wanted to order everything from them. If I buy their mount (that raises the sight a bit and provides a rail), as well as the sight, would I need anything else to mount the EOTech sight? I have an A2 removeable carry handle on my gun. 3. I am interested in getting a BUIS. How do the folding sights, also from LaRue work? Will it all fit on my gun without having to have the sight hang over the front hand guard? (I don't really like how that looks) 4. If I buy the LaRue rear Iron Sight, can I use it with the stock Front sight? Here's the exact gun I bought on BM's site: http://www.bushmaster.com/catalog_xm15_BCWA3F16M4-GP.asp (It says it's a LE model but I bought it at a gun store?) Any tips and tricks would be appreciated. Thanks for your help. |
|
I believe the model number differences refer to battery requirement, and NV capability.
I have a 552, and it uses AA batteries and has NV capability. the 551 also uses AA batteries, but doesn't have NV capability. I have the EoTech mounted directly on the receiver rail. Because of its length it does hang over the edge of the forward edge of the receiver a couple of inches. The BUIS (ARMS40L) is mounted on the aft end of the rail. The position of the EoTech that far forward allows easy access to the EoTEch controls. Without the overhang, the controls were accessable, but not easily, and impossible with gloves. I think the new EoTEch (557) has a built-in riser to give lower 1/3 cowittness, and with the controls on the side, the EoTech can be set back on the receiver, closere to the BUIS. If I were going to do it again, I'd look at that option. |
 Welcome to the site!
The EoTech model numbers differ between ones that have Night Vision capability, and what types of batteries they use. I don't remember which ones are which, but I'm sure others will be along that do. The LaRue should allow you to mount the EoTech right to the rifle. You can also mount it to the rifle without any addons. Depending on which rear sight you get, and which model Eotech, you may see the Eotech hanging over a little bit. The Eotechs that take AA batteries are a little longer than the others. Also, when using the riser Larue Mount, you will have the BUIS in the lower 1/3 of the Eotech window for co-witness. Some people like this, and some don't. I looked at the link, but wasn't sure if the front sight pictured comes with the rifle or not. If it does, I don't know what type and if the front sight post will work with LaRue rear sight without going to a taller front sight post. |
|
Quoted:
I think the new EoTEch (557) has a built-in riser to give lower 1/3 cowittness, and with the controls on the side, the EoTech can be set back on the receiver, closere to the BUIS. If I were going to do it again, I'd look at that option. Ah okay, so you would recommend shelling out a bit of extra cash and going for the 557 model? Also, have you heard good things about the LaRue BUIS? |
|
Models starts with 51X has NO NV compatibility
55X HAS NV compatibility models ends with XX6 or 7 is the newer design which is raise 7mm and has better waterproof capability. And ending number also distinguish the use of batt. model. 5X1, 5X6 uses CR123, 5X2 and 5X7 uses AA batt. I forgot which model uses N batt. sorry. |
|
Quoted:
Quoted:
I think the new EoTEch (557) has a built-in riser to give lower 1/3 cowittness, and with the controls on the side, the EoTech can be set back on the receiver, closere to the BUIS. If I were going to do it again, I'd look at that option. Ah okay, so you would recommend shelling out a bit of extra cash and going for the 557 model? Also, have you heard good things about the LaRue BUIS? I think the side-mounted controls make a lot of sense for the EoTEch. I don't know what the delta price is for the 557, and that would have to be considered. The co-wittness issue has to also be considered––the 557 because it is "taller"(at least that is what I've seen posted on this Board) than the 552, gives lower 1/3 co-wittness of the BUIS with the EoTech mounted directly to the receiver. The 552 mounted directly to the receiver gives an absolute co-wittness with the BUIS. I like the idea of no riser as its one less connection to loosen up and lose zero. I wouldn't pay anything for NV––I didn't have any choice when i bought the 552 as it was all that was available. There's been some ugly rumors about 552s eating batteries even when not turned on. That hasn't been my experience––I've had the same batteries for two years––although I did notice that the reticle was blinking the last time I used the sight––I think that means the batteries are about to go TU. I don't know anything about the LaRue BUIS, but all LaRue products have an excellant reputation, and I'd assume their BUIS would share that reputation. I just bought a LaRue scope mount for an AR, and it's a very nice piece of gear. |
|
Thanks much for your help. I think I'll call them tomorrow and ask them if I can use their BUIS with my stockie front. They might not be able to tell me 100% for sure, but who knows, maybe they can afterall. :)
I'll look into the 557, but I kinda like the idea of "absolute cowitness" also, as that seems to be more comfortable than having to use the bottom 1/3rd. |
|
Quoted:
Thanks much for your help. I think I'll call them tomorrow and ask them if I can use their BUIS with my stockie front. They might not be able to tell me 100% for sure, but who knows, maybe they can afterall. :) I'll look into the 557, but I kinda like the idea of "absolute cowitness" also, as that seems to be more comfortable than having to use the bottom 1/3rd. I'm sure you'll find that unless specified otherwise, AR sights are compatible with the standard 1.40" above the rail protocol––that is the iron sight, line-of-sight is 1.40 inches above the rail with both the front and rear sights being at that height. |
|
Quoted:
Awesome, that's what I was hoping to hear. :) What's really cool too is my front sight might actually be a folding sight. I'll have to look into it more when I get home. :) You might wanna check out GG&Gs website––GGG. They have package deals on EoTechs packaged with their accessories, the Accucam and the EoTEch lens covers. The Accucam is an add-on camlock for the EoTech which takes the place of the EoTech thumbscrew. Definitely worth considering. The lens covers are nice but not a mandatory piece of kit. GGG also has a line of BUIS, and other stuff which is reasonably priced and good quality. |
|
Hey Skip,
Just wanted to thank you again man. I ended up ordering the entire setup from GG&G. I got their QD mount + lens covers + EOTech 552. I also picked up their BUIS. I can't wait to put it all on my gun. :D Oh, and on a side note my stock front sight can be collapsed down too. :D So, that means, once I zero the thing I can remove both my sights from the picture and put them up in case of a battery/optics failure. I'm so excited! Now just to figure out how the hell to zero both the BUIS and the EOTech. :o Edit #2: Just looked at the sight picture thread and after verifying the engraving on my front sight, I confirmed my bushy came stock with a Yankee Hill Machine folding front sight. :) |
|
Quoted:
Hey Skip, Just wanted to thank you again man. I ended up ordering the entire setup from GG&G. I got their QD mount + lens covers + EOTech 552. I also picked up their BUIS. I can't wait to put it all on my gun. :D Oh, and on a side note my stock front sight can be collapsed down too. :D So, that means, once I zero the thing I can remove both my sights from the picture and put them up in case of a battery/optics failure. I'm so excited! Now just to figure out how the hell to zero both the BUIS and the EOTech. :o Edit #2: Just looked at the sight picture thread and after verifying the engraving on my front sight, I confirmed my bushy came stock with a Yankee Hill Machine folding front sight. :) The zeroing thing is kinda intimidating at first but it boils down to this: (1) Forget the iron sights or there, or fold them out of the way. (2) Zero the EoTech as you would normally do any sight. Leave the Eotech turned on. (2) Deploy the iron sights if they've been stowed. (3) Looking through the iron sights, adjust the windage on the BUIS until the Eotech dot is centered somewhere on the front post. The red dot will "probably" not be sitting on top of the front post where you want it. (4) Adjust as necessary, the front post up or down, until the red dot is sitting on top of the front post when sighting through the rear sight. (5) Turn off the Eotech and verify the irons zero by shooting the rifle at the zeroging range you've selected (the same range you used for the Eotech) Fine tune the iron sights as appropriate, but you shouldn't have to. Remember the BUIS are BACKUPs, and would normally be used when the primary system (the Eotech is inop). As with any back-up system, the BUIS will probably not be as precise as the primary system. Having cowittnessed everything, you can have the Eotech red dot anywhere in the Eotech field of view and it will be shoot to the point of aim as indicated by the red dot. There is no need or advantage to be gained by sighting through the BUIS, AND using the red dot at the same time. Sorry if this is obvious to you, but you'd be surprised at the confusion on this issue––these are two independent sighting systems which you have caused to have the same point of aim. They should not be used together. as there's no advantage to be gained. Good luck. |
AR Sponsor