M14 front sight height

geetus

geetus

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I am looking for information pertaining to the different front sight heights for the M14 rifles. How do you determine how much higher a front sight needs to be for when you do a chop? Or say when mounting the dove tail to the gas lock? Or... say when doing a custom setup? ;)

I am looking for a starting point as if it shoots high you can always remove material to bring the POI down.
 
I am looking for a starting point as if it shoots high you can always remove material to bring the POI down.
Click to expand...
Wait a sec .... you can't change the POI .. only your viewpoint. If the POI is high you have to RAISE the front sight(or lower the rear) to bring your line of sight UP TO the POI.
Please correct me if I'm wrong
 
Correct....front sight has to be moved in opposite direction of where you want Point Of Impact to move....rear sight moves in the same direction...

example....front sight is cut down to raise POI....rear sight is moved up to raise POI.......front sight moved to the right to move poi to the left....rear sight moved to the right to move POI to the right
 
Dozens have done this already, someone must know the standard.

Do you have a laser pointer?
Through the peep and touch the front sight, measure the height above a fixed point, say the gas block. Easy enough to repeat whatever your barrel length ends up.

Or just look through the sights. Set a washer on the gas block, still see the sights?
Try different stuff till you get the right height so you can just barely see the front post.


Or do the math by measuring the difference in barrel diameter now and at your desired length.
 
This person glued a tie wrap on top of his sight and then trimmed it to fit to make up the required change in front sight heigth
IMG_0529.jpg


Smith enterpises sells 2 different fron gas locks ...one for 22 in barrels and one for 18.5 in barrel..the shorter barrel requires a higher front sight...shown in this post http://www.canadiangunnutz.com/forum/showthread.php?t=566379
 
the laser pointer is a good idea if held fast in an appropriate position.
the pic above shows one of the early UFS mods we did which ended up being short of the desired height for the position on the barrel.
what we found was with usgi cylinders and barrels, we could find that happy distance and stick to it within a small degree of tolerance. BUT this did not apply when the same jigging methods were used on chinese cylinders..... using a preditermined height for the dovetail base positon.
Now when we install the UFS modification as shown above, every single one must be custom fitted to the individual gas cylinder and barrel it is intended for use on. This allow us to take into account the variations between barrel splineway/cylinder spline index agreement , barrel and gas plug hole location tolerances and cylinder ring thickness variations....... it's truly a pain in the @ss , but folks seem to be really liking thier rifles equiped with it.
as for a number for blade height at the gas lock........ get a marstar navy gas lock and a caliper and start measuring.... thier model has a pin height that is pretty close for zero on a 18.5" barrel. For the gas cylinder ring front sight (UFS), we are about 24 to 30 thou higher to ensure a low click zero at the rear sight.

on a standard length barrel with the front sight on the standard flash hider, raising or reducing the front blade height, or moving the front sight side to side in increments of 8 thou will move you 1 inch in chosen direction at 100 yards/meters .... i don't have the calculations handy for this at the gas lock location.
 
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