What size riser do I need for 1/3 co-witness? I have an AR-15 flattop with fixed A2 front post and MBUS rear flip. This setup is absolute co-witness.
1883120
I have two ARs: flattop with Magpul MBUS front and rear, the other with the A2 front and MBUS rear. No riser of any kind was needed for either.
1883121
Same as the other guy, I have A2 front and rear MBUS and no need for any riser. Perfect as is.
902444
From the top of the rail to the top of the sight, in the flipped up position, is 1.5 inches. Though I haven't done it myself, I wouldn't be surprised if some shooters use a riser under them.
2196048
I have a similar sight, same style, different brand name. This riser gives the actual red dot a height of 1.5 inches above your flat top. Also,the 5 slots line up to the exact length of the mount on the bottom of the sight. Hope that helps.
2155378
This sight has a mil standard post just like on any other AR/m16 adjustable for elevation. Any standard mil spec post should fit just fine. You don't necessarily need a tool to adjust it. I used a small nail to depress the plunger and it worked fine, though I now have the tool. Also, choose your rear sight carefully. Some fronts and backs don't work well together This one works fine with the flip up UTG rear (which does not have elevation adjustment), but won't work with some other varieties due to their lack of elevation adjustment, or not enough adjustment to get them aligned properly. This sight has a mil standard post just like on any other AR/m16 adjustable for elevation. Any standard mil spec post should fit just fine. You don't necessarily need a tool to adjust it. I used a small nail to depress the plunger and it worked fine, though I now have the tool. Also, choose your rear sight carefully. Some fronts and backs don't work well together This one works fine with the flip up UTG rear (which does not have elevation adjustment), but won't work with some other varieties due to their lack of elevation adjustment, or not enough adjustment to get them aligned... » Read More This sight has a mil standard post just like on any other AR/m16 adjustable for elevation. Any standard mil spec post should fit just fine. You don't necessarily need a tool to adjust it. I used a small nail to depress the plunger and it worked fine, though I now have the tool. Also, choose your rear sight carefully. Some fronts and backs don't work well together This one works fine with the flip up UTG rear (which does not have elevation adjustment), but won't work with some other varieties due to their lack of elevation adjustment, or not enough adjustment to get them aligned properly. « Show Less
2004668
Although I did not use on an AR, I use a 3/4" riser on the scopes I do use.
1156539
Hello, Paula. I have a Vortex SPARC red dot with various risers that works just fine.
1517782
Not being a gun enthusiast, I don't know what he means by CO-WITNESS. I did not mount a riser on mine.
1084682
I just learned the hard way. Definitely absolute co-witness with your irons on an AR. Just ordered the High Rise. I hope there is free shipping on the return otherwise I'll bave a mount laying around.
654736
The rear is not tall enough to work with fixed A2 front sight. You'll have to mount it on a riser rail, prob 1/2" rise.
743964
im not exactly sure since i'm not familiar with your rifle. I have the standard A2 front sight and a rear magpul flip up (probably as you do). I had to switch the highrise to a shorter one (from UTG) to get a better lower 1/3 co-witness. the high rise mount the TRS-25 came with was a little high. good luck
37023
I am not sure just exactly what you are asking, but hope the following might be of some help. I installed the subject riser on an M4 carbine I built up using a Mil spec A3 upper receiver. I just measured the dimensions of the rail widths and found both the riser mount clamps and the scope ring clamps measured .833" wide. This unit was advertised to be compatible with either a standard picatinny or a weaver rails system. I believe it is. I did not want to break down my system to determine maximum widths possible, but I am sure it would go a few thousanths of an inch wider on another rail if required. I am not sure just exactly what you are asking, but hope the following might be of some help. I installed the subject riser on an M4 carbine I built up using a Mil spec A3 upper receiver. I just measured the dimensions of the rail widths and found both the riser mount clamps and the scope ring clamps measured .833" wide. This unit was advertised to be compatible with either a standard picatinny or a weaver rails system. I believe it is. I did not want to break down my system to determine maximum widths possible, but I am sure it would go a few thousanths of an inch wider on another... » Read More I am not sure just exactly what you are asking, but hope the following might be of some help. I installed the subject riser on an M4 carbine I built up using a Mil spec A3 upper receiver. I just measured the dimensions of the rail widths and found both the riser mount clamps and the scope ring clamps measured .833" wide. This unit was advertised to be compatible with either a standard picatinny or a weaver rails system. I believe it is. I did not want to break down my system to determine maximum widths possible, but I am sure it would go a few thousanths of an inch wider on another rail if required. « Show Less
229659
I used this scope on a flat-top receiver without a FSB. I used a mount with a 1" rise. I do have another rifle with a FSB and similar scope. Did not use a riser on it. FSB only shows up as a very small blur. Does not affect ability to hit targets.
205365
Depends on the sight that you are using. I am using a Bushnell 3x9x40 I tried it with and without a riser. Without the riser it was clear of the sight. But i am also using a redfeid red dot with laser and found that it will not clear the front sight without a riser. I also have discovered that the Bushnell works very well with the set up. without the riser I can centre my Bushnell scope to the A2 front site for deadly accurate distance shot. It is a good mount for AR platform. I hope this helps.
1889100
I have an A1 front sight on my BCM AR15 and ordered the med. riser to mount the UTG CQB on. It worked perfectly and the scope is amazing for the price!
1764605
I have the same BUS and yes, the riser is ar15 specific and work perfectly.
250259
The sight will 1/3 co-witness with the irons depending on what sights you are using. I am currently using gen 2 magpul Mbps sights. The emitter in the sight is located at 5 o'clock and partially blocks the front sight so that you can see the FS post and the left blade. Personally I would buy the sight w/o the hi rise block and invest in a better mount. Daniel Defense makes a absolute co-witness riser that runs around $60 on amazon. Good luck
947365
It should work just fine. If not, then add a UTG Low Riser to bring it up. I know this from trial and error. I have a medium and a high riser that were too high.