Shooting 2 inches low, need new sights

[Charlie-AKA]

Hi guys, I just got a 75 B compact in .40 and it shoots about 2 inches low at 7-10 yards, no matter what ammo I use. Will the Meprolight night sights for the P-01 work on this gun and raise the point of impact? If not, what sights will get me shooting straight with this gun?

[Skookum]

As I recall, CZ-USA sells stock rear sights for the CZ 75/85 for a reasonable price ($9/ea?) in seven heights.  The difference in height increment is 0.01 inch (about 0.25 mm).  One size up or down should alter the POI by about 0.5 inch at 7 yards, given a sight radius of 5.31 inches (measured on my 75 Compact).

CZ-USA offers Meprolight sights for the 75/85 in three heights.  I don't know the height differences, but will guess it's the same for the stock sights.

What does the factory paperwork say the POI was when it was test fired at the factory at 25 m?

[kobus]

see by how much you have to raise your front sight in relation to the rear sight to match the poa with the poi.  eg if 1mm up gets your poi 2" higher then you have to change the front sight to one that is 1mm lower that the existing one.

[1SOW]

[Charlie-AKA]

David from CGW said all the CZ front sights are the same, the back sights vary in size. What's the deal, did CZ put the wrong back sight on this gun? I know that guns will zero differently depending on the person.

[BGlas]

Are you placing the sight below what you are aiming at or covering up what you are aiming at?  There are a couple threads on it and some pictures in another thread somewhere, I'll see if I can find them.

[kobus]

David from CGW said all the CZ front sights are the same, the back sights vary in size. What's the deal, did CZ put the wrong back sight on this gun? I know that guns will zero differently depending on the person.

that is not correct. check out this link.

http://www.czub.cz/en/catalog/370-pistols/PM3A/1091-1283.aspx

i agree with BGlas.  poa and sight picture is important.  if you can't replace or adjust your sights then simply adjust your poa.

[Skookum]

that is not correct. check out this link.

http://www.czub.cz/en/catalog/370-pistols/PM3A/1091-1283.aspx

The link shows fiber optic sights with a fixed front sight height and three options for rear sight height that differ by an increment of 0.25 mm (about 0.01 in).

poa and sight picture is important.  if you can't replace or adjust your sights then simply adjust your poa.

When POA and POI differ by 2 in at self-defense distance, a slightly different sight picture won't solve the problem.

[Skookum]

[D]id CZ put the wrong back sight on this gun? I know that guns will zero differently depending on the person.

The height of your rear sight is coded on the bottom.  You have to remove the sight to see the number.

[kobus]

Quote from: kobus on Today at 06:43:22 AM

    that is not correct. check out this link.

    http://www.czub.cz/en/catalog/370-pistols/PM3A/1091-1283.asp

The link shows fiber optic sights with a fixed front sight height and three options for rear sight height that differ by an increment of 0.25 mm (about 0.01 in).



if that is the case then i apologize. i was under the impression that it was the front sight that differs. allow me to remove my foot from my mouth. 

[Skookum]

kobus,

Check out CZ-USA's webstore.  For the Caz 75/85 they sell one front sight and about seven rear sights of differing heights.

By the way, all the numbers I spouted above are from memory.  Fair warning ? no one is awarding me gold stars for memory performance these days.  I advise one to run their own numbers before digging into his wallet.

If my number crunching for the 75 Compact is correct (the results for the 82 and 83 were very similar), the choice of seven rear sights varying by 0.25-mm increments allows one to alter the POI over a span of 3 in, at a 0.5-in resolution, at a target distance of 7 yd.  It appears the aftermarket sights with only three rear sight options limit the adjustment span to 1 in at 0.5-in increments.

[kobus]

but then there are these links that show front sights in eleven different heights. i posted the incorrect link before. sorry.

fibre optic front sights
http://www.czub.cz/en/catalog/370-pistols/PM3A/1091-1253.aspx

single dot front sights
http://www.czub.cz/en/catalog/370-pistols/PM3A/1091-1250.aspx

[jameslovesjammie]

With the factory 3 dot sight, the point of impact is set up to be where the 3 dots line up, NOT the top of the sight like most brands do.  I personally don't like this, and replacing the rear with a CZCustom Tactical rear sight usually lines the POI inline with the POA using the TOP of the sight.  YMMV.

[Skookum]

but then there are these links that show front sights in eleven different heights. i posted the incorrect link before. sorry.

fibre optic front sights
http://www.czub.cz/en/catalog/370-pistols/PM3A/1091-1253.aspx

The size ? e.g., 1.5?5.50 ? refers to a 1.5-mm high front sight and a 5.50-mm high rear sight.  The front sight is always 1.5-mm high.  Looks like a typo.

single dot front sights
http://www.czub.cz/en/catalog/370-pistols/PM3A/1091-1250.aspx

The heights appear to be rear sight options.  Again, typo.

Note that the rear sight must be higher than the front sight to be functional ? i.e., the pistol must tilt upward slightly to produce a bullet trajectory that compensates for gravitational bullet drop.

Nice to see so many height options, and the heights specified.  It has the CZ-USA webstore beat.  I like the fiber optic sights and their serrated blades, back and front.

[1SOW]

Front Sights are offered at the custom sight in several heights and types, which used to include a plain black blade site that can be filed down to suit..
Because you are shooting LOW,  a shorter sight may or may not be available, so a new rear sight would be needed

If what YOUR GUN needs is not available, it can be purchased at Dawson Precision pretty reasonably made to your needed height, but they measure differently than CZ--so beware..
re sight pic:  This is what I use and recommend---same as an iron sight rifle---same as a within-range scope---same as a red dot at zero'd distances


The two other typical options are:  Three dots aligned with center dot on the target center (I've found Sigs with three dot sights are typically aligned this way.),  A 6:00 Hold for fixed targets at fixed ranges  (Bullseye shooters use this for a more precise aiming point without hiding the "X-ring").