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View Full Version : Fiber optic front post for Tech-Sights


jgolden
10-12-2011, 11:03 AM
I just wanted to document a fiber-optic front post upgrade that I made to my Marlin 795 with Tech-Sights.

I first sent an e-mail to Tech-Sights to see if an AR-15 fiber optic front post would work in their TSM200 model that I had installed on my 795. Larry at Tech-Sights responded very quickly with:
"That should work fine. The only issue on some of the AR posts is that the thread on the bottom can be a little too long. If this is the case you can just file a bit of it off and be good to go."

So, I went ahead and purchased a HiVis brand AR-15/M16 Fiber Optic Front Sight.

http://www.olden.org/frontsight/Package.jpg

I found it slightly cheaper somewhere else where I was already ordering other items but here's the Brownell's listing.
http://www.brownells.com/.aspx/pid=26412/Product/AR-15-M16-FIBER-OPTIC-FRONT-SIGHT
This sight comes with the post, 4 tube inserts (2 green & 2 red) a detent tool, tube removal tool, replacement detent and a carrying tube (w\chain) for holding spare parts. For this application the detent items were not needed since they are for the AR15/M16 front sight.

The Tech-Sights front sight post is held in place with a hex set screw.
http://www.olden.org/frontsight/Orig1.jpg
http://www.olden.org/frontsight/Orig2.jpg
http://www.olden.org/frontsight/Removed.jpg

Dimensionally, both sights have the same height, base diameter, and diameter of the bottom portion of the post. The differences are that the HiVis is longer and threaded while the original is short and smooth.
Note: I used a neon green paint pen to brighten up the original post when I first installed it. They do not come from the factory that way.

http://www.olden.org/frontsight/Comparison_Before.jpg

If you try to install the sight as is, it will bottom out before being seated.
http://www.olden.org/frontsight/TooLong.jpg

...continued...

jgolden
10-12-2011, 11:06 AM
I used a Dremel with a cut-off wheel to remove the extra length.
http://www.olden.org/frontsight/Dremel.jpg

http://www.olden.org/frontsight/Comparison_After.jpg

Here are the after pics showing both tubes installed. The first two were taken while standing next to a window. The last one is un-PhotoShopped taken while in the next room that was a lot darker. Similar to what you might expect in twilight. These are not night sights so don't expect the same performance. But, if your eyes have adjusted to twilight they should improve your ability to get the front sight on a dark colored target.
http://www.olden.org/frontsight/Green1.jpg
http://www.olden.org/frontsight/Red1.jpg
http://www.olden.org/frontsight/Red2.jpg

Slicendice
10-12-2011, 2:34 PM
Looks good! I still need to put more rounds down range with my 795...:30: