UMP zero - check my logic

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Omega21

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Went to an indoor range today to sight in (zero) my new UMP fuse job in 9mm. This is my first experience with a 9mm UMP (I have much more with the UMP45). This is in preparation for October's MP5/UMP advanced course with Teufelshund Tactical. James wants people to zero subguns at 25m (82 feet) which is also factory zero on the UMP. Since I installed an XS tritium front sight and the rear was removed and re-installed, the zero on the gun was off.

Maximum distance in my indoor range today is 75 feet (22.7 meters) so I tried zeroing there. Problem was that if I wore my glasses the target was clear but the front sight was very blurry. If I took my glasses off, the opposite happened. I made some gross adjustments at this range, but a precision zero was not going to happen.

So I moved the the target to 50 feet (15M) and kept my glasses on. This made the front sight blurry like before, but the larger (closer) target made consistent aiming easy. I got a really nice precise zero here.

Pushing the target back to 75 feet (22.7M) shots were slightly below POI as expected, but with a blurry front sight, aiming slightly high to compensate wasn't super successful.

Other than the walk-back drill of the MP5/UMP class (that involves shooting out to ~200 Meters), the vast majority of engagements at the class are between 7 and 65 feet (2-20M). I decided to leave the zero at 50 feet (15M) because that seems like a more middle distance for this class. Plus, I'm just not sure how to get an accurate zero at 25M given what I described above.

I recognize that no matter where I zero, when engaging out to 200M for the walk-back drill, I'm going to have to hold over (as I've gotten used to doing with the UMP45 in previous classes).

Does my logic of leaving the zero at 15M/50' instead of 25M/82' make sense?
 
@Omega21 For normal engagement distances over your zero I would say no. You obviously have issues at distance beyond 15m with iorns so you will have to figure out something that will give you relief from your issue if you wear glasses or not.

If you use the iron sights as zeroed for a close up point of reference you need to remember that small angles at close distances are magnified at longer distances.

The obvious thing to do is to use a good RDS to help in regard to your issue. Find a setup that will co-witness with your front sight. If you loose the dot in the RDS just use your iorns as they will still be zeroed. If thats distracting, then use the RDS window as an improvised rear appeture by centering the front on your target and centering it in the RDS window. This is fast and easy and works very well as you are ignoring the rear sight and the front is just a stand in for the dot. Trust me the front sight will be easier to see and line up like when using the RDS as normal. Also you can practice this easily by turning the dot off. Try it you will be amazed.
 
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flybynt said:
@Omega21 For normal engagement distances over your zero I would say no. You obviously have issues at distance beyond 15m with iorns so you have to figure out something that will will give you relief from your issue glasses or not.

If you use the iron sights as zeroed for a point of reference remember small angles at close distances are magnified at longer distances.

The obvious thing to do is to use a good RDS to help in regard to your issue. Find a setup that will cowitness with your front sight. If you loose the dot in the RDS just use your iorns as they will still be zeroed. If thats distracting then use the RDS window as an improvised rear appeture by centering the front on your target and centering it in the RDS window. This is fast and easy and works very well as you are ignoring the rear sight and the front is just a stand in for the dot. Trust me the front sight will be easier to see and line up like when using the RDS as normal. Also you can practice this easily by turning the dot off. Try it you will be amazed.
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Thats great advise! I have the same issue and found your soloution works for me. The front sight is easier to focus on!
 
OK @flybynt I'll give it a shot. I have a 2MOA Micro T2 on my AR and a 2 MOA MRO I just got for Tom's MP5 class that got canceled. I'll take those out and see if I can get a co-witness with the irons, and do what you recommend. If not, I'll try the RDS independent of the front sight. I'll try and get a range trip in this weekend and report back. Thanks for the advice.
 
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