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Posted: 11/15/2009 9:59:59 PM EDT
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Howdy all. Could sure use your advice.
I'd like to replace the stock front sight post on my RRA M4 with either a tritium dot front sight post or with a fiber optic post. The weapon is currently sighted in at 100 yards. The questions for those who have done the replacement: Did you go with a fiber optic (such as a Hi-Viz) or with a tritium dot? And why did you choose the one you did? When you replace the sight, how do you determine how far to screw the new post in to get close to your original zero? Do you measure the top of the existing post prior to removal from some fixed point on the rifle and then bring the top of the new sight down to that position? If if helps, I do have a Streamlight TLR 1 mounted on the front sight via a Daniel Defense front sight rail, and yes, I've tried those glow in the dark paints without much success. I'm leaning toward the fiber optic but I'd like your input first. Thanks a bunch Mike |
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Tritium for sure. I'd highly recommend the Trijicon brand. Their FSP is unique in that the top disc will spin 360-degrees so that the dot is facing the shooter. The bottom disc together with the top disc is adjusted by 90-degree clicks to set your elevation.
Once set just spin the top disc as described above. Not all manufacturers do this. Trijicon provides the removal tool also. |
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Not sure the Trijicon with the fiber optic tube + the tritium would work. I'm using a Daniel Defense front sight mounted mini-rail to mount a Streamlight TLR1 and the Trijicon has a long post that hangs down below the actual sight.
I'm wondering about the Hi-Viz. I have a Trijicon tritium front sight dot on my other carbine, but I'm wondering about the performance in a low light situation of the Hi-Viz with the pipe, Thoughts? Thanks again Mike |
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Well, went out and purchased the Tru-Glo AR front sight. Not cheap!
It drops down into the channel where your detent pin + spring goes, and I had to dremel out the channel slightly to get it to fit. Then, you have to thread this little itty bitty 3/16" cap nut onto the bottom of a spring like thing that sits within the front sight frame. No wrench made in the free world that I know of will fit onto this thing in the limited space that is the AR front sight frame. Had to use a hemostat and a lot of contortions to get it tight. I measured the original post height that had been sighted in at 50 yards and mounted this one to that exact height. Went to the range today - and was barely on the paper high at 50 yards. Go to adjust it using their supplied tool and it wouldn't fit around the sight to get it to move counter-clockwise iaw the supplied directions. Also, the adjustment star wheel is so damned small that I had to use an Opti-Visor just to see it. I am not amused as my range is 50 miles one way. Get it home and go after the adjustment star-wheel with dental picks and finally got it to move. Jacked that suckah way up. But now I'm wondering if it will stay where I put it once it's adjusted. Another trip to the range tomorrow, this time with my dental picks and Opti-Visor in tow. I'll give an after action report tomorrow, but so far I have to tell you that I'm beginning to regret not going with the much more simple Hi-Viz product. We'll see. |
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As promised, the after-action report.
Returned to the range and got the weapon sighted in at 50 Meters. I HOPE this thing stays locked in where I put it! Once I got the post jacked upward (much higher than the original post was) the provided sight adjustment tool became somewhat effective, but it wasn't really user friendly. What threw me the most is to get the rounds into the bullseye, I have this post way higher than the original. I mean like holy cow high. It's still well below the tips of the protective ears, but wow. If I had to do it all over again I think I'd go with the HI-Viz because of its simplicity and ease of installation. Just my .02 and I hope this helps someone considering either product. Mike |
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