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Grouping low


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#1 subMOA

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Posted 07 February 2011 - 09:19 AM

Hi - I just started testing my new MkIV and it is grouping about 4-6" low @ 10M

I don't see any sight adjustments [not really common on 1911's anyway].

Is this a simple matter of Hop up adjustment or do I need to shim the barrel?

Thanks

#2 gcw360

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Posted 07 February 2011 - 02:21 PM

Increase the hop.  That should fix it. :gun:

#3 greatwatermelon

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Posted 07 February 2011 - 02:49 PM

View PostsubMOA, on 07 February 2011 - 09:19 AM, said:

Hi - I just started testing my new MkIV and it is grouping about 4-6" low @ 10M

I don't see any sight adjustments [not really common on 1911's anyway].

Is this a simple matter of Hop up adjustment or do I need to shim the barrel?

Thanks

You may have packing grease in your bucking. Get a q-tip and gently rub and clean the inside of your hop up bucking. That should help a bit.

#4 subMOA

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Posted 07 February 2011 - 02:52 PM

View Postgcw360, on 07 February 2011 - 02:21 PM, said:

Increase the hop.  That should fix it. :gun:

Thanks, I'll give that a try.
I didn't expect hop up to come into play at such a short distance.

View Postgreatwatermelon, on 07 February 2011 - 02:49 PM, said:

You may have packing grease in your bucking. Get a q-tip and gently rub and clean the inside of your hop up bucking. That should help a bit.
I'll check this too.

#5 gcw360

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Posted 07 February 2011 - 03:59 PM

:gun: Here, this may help.  http://www.kwausa.co...?showtopic=3111





#6 Spiggy

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Posted 08 February 2011 - 01:08 PM

View PostsubMOA, on 07 February 2011 - 02:52 PM, said:

Thanks, I'll give that a try.
I didn't expect hop up to come into play at such a short distance.


I'll check this too.
as far as trajectory modification, it doesn't.  But the engagement of the hopup does stabilize the flight of the bb.


Also, what weight bbs are you using?

#7 subMOA

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Posted 10 February 2011 - 09:02 AM

View Postgcw360, on 07 February 2011 - 03:59 PM, said:


All great tips. thanks to all who replied.

A quick swab and some hop up adjustment helped quite a bit.

I plan a  field strip today with full clean and lube. This should tighten my groupings even more.

FYI - I use Molybdenum paste as a slide lubricant. It has superior friction coefficient, great boding properties and is great for hard or soft metals. More expensive than your typical lubricants but out performs on every level.

#8 subMOA

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Posted 10 February 2011 - 09:06 AM

View PostSpiggy, on 08 February 2011 - 01:08 PM, said:

as far as trajectory modification, it doesn't.  But the engagement of the hopup does stabilize the flight of the bb.


Also, what weight bbs are you using?

Yea I was thinking the hop up shouldn't come into play @ 6-10 meters [my testing distance]. It was more likely packing lubricants that needed to be cleared/cleaned.

I am using the standard .20 that come with the pistol.

#9 Spiggy

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Posted 10 February 2011 - 01:54 PM

Try some heavier 0.25g bbs, the supplied bbs are intended for action proving, not so much for accuracy testing.  



:turned: try a light surface of oil or a dry lubricant.  Grease viscosity can still impart friction on a moving part.  :shifty:




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