Matech 600m BUIS

[Jicko]

There is no 100 marking.

Matech only have 200, 300, |, 400, 450, 500, 550, 600 markings.

[maxicon]

A 200 yard zero is about the same as 50 yards, and is a good general purpose zero.

If you set the Matech at 200 and zero at either 50 or 200, it'll be within 2" from 25 to 250 yards without adjustments. If you need to pull in that extra bit of accuracy, you can then adjust the sight for the distance you're shooting at.

Since it doesn't have a 100 yard setting, I'm not sure there are a lot of options with the Matech. You could zero at 100 yards on the 200 yard setting, then make a chart for the other settings, but that's getting a little tedious.

This thread is for the standard A2 sight, but the trajectories are good for any sight. You'll be 1.6" (give or take) high at 100 yards, which is pretty small for iron sight shooting.

http://www.ar15.com/forums/topic.html?b=3&f=18&t=328143

[pbrand]

We use the matech as a standard rear sight for marksmanship qualification in the Marine Corps.

On an m16a4 spec upper, shooting m855 (62 gr, green tip), zeroing the rifle in at 25 yards on that white hash between 300 and 400 makes it good to go for every other setting. Shoot at 200? just rotate it to 200, 300 to 300, etc etc. No need for compensating, it'll be dead on with the right upper and load.

It's a good sight. No complaints here.

If you are shooting at 50 - 100 yards what hash mark would you adjust it to? By the way, this information was very helpful as I need to sight mine in for my next range trip.

[maxicon]

At 50 yards, you could set it to the 200 yard mark and be pretty close. I don't know what you'd use for 100 yards.

It's essentially a longer range sight, with the 200 yard lowest marking and the small aperture size.

[Stockton]

There is no 100 marking.

Matech only have 200, 300, |, 400, 450, 500, 550, 600 markings.

My apologies, you are right there is no 100. Same stands as to hitting a 100yd target when zeroed at 25m and when set between 300 and 400. We qual from 50yds to 300yds with no adjustments after zero on Ivans.

[Jicko]

I am putting it on my 18" SPR as my BUIS, while I already have a Leupold Mark 4 and a Doctor on the gun.

Yet, I really want to learn about this sight, it seems to have great potential.

I will continue to do some testings and math with this sight and I will report back later! Thanks for all the starting pointers.

[pbrand]

Forgive my lack of knowledge when it comes to MOA and properly sighting in irons.

I have MATech BUIS and standard A2 front site/gasblock. I shoot outdoor at ranges from 25, 50, 100, 150, 200, and 300 yards. Most of my paper shooting is 50 - 100 yards.

Imagine yourself explaining the sight in process to a mildy retarded 12 year old thats slightly autisctic. How would I site this in properly? It sounds like you site it in at 25 yards on the | hash mark and you are good to go from 200 up. What do I use when shooting below a 200m target?

[Stockton]

First you need this:
-M16 A4/M4 carbine (variants)
-62grain ammo (others may or may not work w/matech to exact)
-25 meter Zero Target - Can be found online and directions are printed on the target.
-25 meter distance
-Flush your front sight post
-Zero your windage out
-Shoot rifle and make adjustments till shot group is in the circle
(elevation=front sight post)(windage=matech)
You are now zeroed to shoot 50 - 300yds without adjustment for upper torso hits.

If you want to shoot beyond 300yds then you can adjust the necessary distance by rotating the elevation knob on the matech. Shooting 300 and under does not require any adjustments....period.

[MrSlippyFist]

First you need this:
-M16 A4/M4 carbine (variants)
-62grain ammo (others may or may not work w/matech to exact)
-25 meter Zero Target - Can be found online and directions are printed on the target.
-25 meter distance
-Flush your front sight post
-Zero your windage out
-Shoot rifle and make adjustments till shot group is in the circle
(elevation=front sight post)(windage=matech)
You are now zeroed to shoot 50 - 300yds without adjustment for upper torso hits.

If you want to shoot beyond 300yds then you can adjust the necessary distance by rotating the elevation knob on the matech. Shooting 300 and under does not require any adjustments....period.

That's as easy and descriptive as it gets.

[Jicko]

Again,

for M16A4, 20", zero with the harsh | mark

for M4, 14.5"/16", zero with the 300 mark

Then shooting anywhere from 0-300 yds/m, no elevation adjustments to the Matech.

[pbrand]

Again,

for M16A4, 20", zero with the harsh | mark

for M4, 14.5"/16", zero with the 300 mark

Then shooting anywhere from 0-300 yds/m, no elevation adjustments to the Matech.

Thanks!

[pbrand]

First you need this:
-M16 A4/M4 carbine (variants)
-62grain ammo (others may or may not work w/matech to exact)
-25 meter Zero Target - Can be found online and directions are printed on the target.
-25 meter distance
-Flush your front sight post
-Zero your windage out
-Shoot rifle and make adjustments till shot group is in the circle
(elevation=front sight post)(windage=matech)
You are now zeroed to shoot 50 - 300yds without adjustment for upper torso hits.

If you want to shoot beyond 300yds then you can adjust the necessary distance by rotating the elevation knob on the matech. Shooting 300 and under does not require any adjustments....period.

And thanks!

[Jicko]

Something is just WRONG

I did some calculations, there are HUGE differences between M193 and M855 POI at distances!

M193:
- 55gr FMJBT
- BC .243
- MV 3100fps

M855:
- 62gr FMJBT
- BC .304
- MV 3025fps

	M193 Zero@30	M855 Zero@300	
	3100 fps	3025 fps	
Range	Drop	Drop	Drop	Drop
(yd)	(in)	(moa)	(in)	(moa)
50	0.8	1.5	1.7	3.2
100	2.1	2	3.8	3.7
150	2.2	1.4	4.9	3.1
200	0.9	0.4	4.7	2.3
250	-1.9	-0.7	3.1	1.2
300	-6.6	-2.1	0	0
350	-13.4	-3.7	-4.9	-1.3
400	-22.8	-5.4	-11.8	-2.8
450	-35.1	-7.5	-21	-4.5
500	-51	-9.7	-32.7	-6.2
550	-71.1	-12.3	-47.4	-8.2
600	-96.1	-15.3	-65.5	-10.4

(Sources: JBM calc)



So, the Matech BUIS is for M855, 62gr FMJBT?

5.56 NATO Ball Ammunition Ballistic Comparison
                   based on Aberdeen Proving Ground Data
       velocity (fps)    trajectory (in.)  drop (inches)  drift (inches)*
 range   M193   M855       M193  M855      M193   M855     M193    M855
(meters)
  0      3,200  3,100     -2.5   -2.5       0.0    0.0      0.0     0.0
100      2,774  2,751     +2.8   +4.4      -2.2   -2.3      1.3     1.1
200      2,374  2,420     +2.7   +5.8      -9.9  -10.2      5.8     4.9
300      2,012  2,115     -4.9    0.0     -25.1  -25.3     14.2    11.8
400      1,680  1,833    -23.0  -15.0     -50.8  -49.5     27.6    22.4
500      1,373  1,569    -56.2  -42.9     -91.6  -86.7     47.5    38.0
600      1,106  1,323   -113.1  -88.2    -156.1 -141.3     76.4    59.5
700        995  1,106   -206.8 -156.1    -257.3 -220.9    113.5    88.4
800        927  1,010   -339.9 -267.7    -398.0 -339.2    156.1   124.9

                                                   * Drift for 10 mph wind.
M193 Ball ammunition fired in M16A1 rifle with 250 meter battle sight zero.
M855 Ball ammunition fired in M16A2 rifle with 300 meter battle sight zero.

(Source: http://www.ak-47.net/ammo/ss109.txt)


In both of the above calculations, say for 600yds, if you are NOT using the ammo the Matech is intended for, your shot will be totally OFF. From the 1st calc, it is either 96.1" drop for M193, while it is 65.5" drop for M855, you would be 30" off!! From the 2nd set of calc, it is either 113" drop for M193, while it is 82" drop for M855, again, you would be 30" off!!

I would REALLY love to know what's the MOA dropping is each of the Matech marking is set for, I may have to do an experiment to shoot all the different settings at a target at 100yds to figure(reverse engineer) it out. PLEASE let me know if anyone of you have some reference docs.

Lastly, anyone know what's the "KAC 600m Flip-up Rear BUIS" is designed for? Also, how does this relate to the stardard "carry handle sight"? How does this relate to all the other 3-600 adjustable sights? What ammo are they DESIGNED for? I am really puzzled now.

(should we start a new thread?)
here it is: http://www.calguns.net/calgunforum/s...d.php?t=144651

[JWI]

When zeroing the M4 on the 25M M4 target, how many clicks on the BUIS for each 13 mm square of windage adjustment? In other words, on the M4 target is it one click or two per square?

With the front sight post, I think it was one click per square for elevation adjustment, correct?

Thanks.