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rocketsci
04-18-2011, 1:01 PM
Greetings Calguns!

I just received a new CMMG dedicated .22lr upper, and while shooting it this past weekend, I noticed that the point of impact was about 6" lower than point of aim.

Since I didn't have any tools with me (go figure, I was too eager to go shooting!), I found that I had to aim about 1/2 way down the front post.

Is this normal/typical for this setup? Will there be problems with adjusting the elevation that much?

Windage was fine after a few adjustments to the rear sight.

It is a M4 LE with the F marked triangular frnot sight and a Magpul MBUS (1st gen) for the rear sight.

Thank you!

rescuerigger
04-18-2011, 7:24 PM
The problem might be with height of the BUIS.

From CMMG website: "The F marked FSB is the correct height sight for a flat top M4 receiver and the detachable carry handle or folding rear sight."

Call CMMG and ask the Techs. They are very helpful. Contact info is on the website.

http://www.cmmginc.com/pages/contact.html

Please PM me when you get it figured out, I have one on order for my AR too.

Good luck!!

tonelar
04-18-2011, 7:29 PM
Im using the same upper with a height adjustable rear sight... Its definitely higher than where a mbus would sit.

shadow65
04-18-2011, 7:58 PM
I'm sure you will have to adjust the front sight for elevation. .22 is not going to have the same poi as a 5.56. I've not used the MBUIS with my .22 set up so I can't really comment on that. I use LMT A2 rear sights or optics. My A2 gives me the ability to adjust for elevation for different distances.
I agree, call CMMG and ask for Lucas.
Dave N

NorCalDustin
04-18-2011, 8:06 PM
Just adjust the front sight post... Sometimes a good deal of adjustment is needed... No big deal. :)

rocketsci
04-19-2011, 12:08 AM
Thanks everyone! Looks like the front post will adjust enough, but I won't know till I make it to the range. In the meantime, I'll drop a line to tech support and see what they say...

Gts408
04-21-2011, 11:09 PM
I have one coming in too. I can't wait to get it. how are the groups on it?

NorCalDustin
04-22-2011, 1:53 AM
I have one coming in too. I can't wait to get it. how are the groups on it?

These are the kind of group's I'm getting:
Eley -- sub 1" groups at 50yrds
Federal Bulk -- ~2" groups at 50yrds
CCI Mini Mags -- ~1.5" at 50yrds
Remington GB's -- ~3.5" groups at 50yrds.


All from the bench.

shadow65
04-22-2011, 7:23 AM
That is real close to mine.
.807 Eley
1.2 CCI Mini Mags
1.29 Winchester 555
@ 50 yards
4x scope from the bench

NorCalDustin
04-22-2011, 10:33 AM
That is real close to mine.
.807 Eley
1.2 CCI Mini Mags
1.29 Winchester 555
@ 50 yards
4x scope from the bench

Yeah... I'm not the greatest bench shooter (I find it uncomfortable to shoot off bags)... I also used my Leatherman to get a rough measurement on the groups.

Like I've always said, a better shooter would probably get better groups... I'm average.

shadow65
04-22-2011, 10:59 AM
Not at all. Don't sell yourself short. I consider that great shooting considering the upper has a stock barrel.
Dave N

510
04-22-2011, 12:01 PM
Hi, not to get this thread off-topic, but where is everyone buying these uppers, direct from CMMG?

NorCalDustin
04-22-2011, 12:07 PM
Hi, not to get this thread off-topic, but where is everyone buying these uppers, direct from CMMG?
I've purchased one direct from CMMG and one from Shadow65 (he has an Ad in the Marketplace).

shadow65
04-22-2011, 12:29 PM
Hi, not to get this thread off-topic, but where is everyone buying these uppers, direct from CMMG?

IM sent

rocketsci
04-22-2011, 1:09 PM
Still waiting for a response and more time at the range to test the adjustment I made...

As for groups, I was shooting CCI mini-mags from a standing offhand position (no sling) and getting 4" groups at 25 yards. Not great, but almost certainly a reflection on the shooter, and not the equipment!

rocketsci
04-22-2011, 1:13 PM
I purchased mine from Mark's Armory before I found out that Shadow65 sells them.

BAGunner
04-22-2011, 2:12 PM
Ditto. I bought mine from Dave (Shadow65) as well.

I've purchased one direct from CMMG and one from Shadow65 (he has an Ad in the Marketplace).

Quickdraw Mcgraw
04-22-2011, 3:19 PM
Hey Shadow...whats the price on a complete upper??

Been thinking bout these for a while...mabye it's time!

NorCalDustin
04-22-2011, 5:53 PM
Still waiting for a response and more time at the range to test the adjustment I made...

As for groups, I was shooting CCI mini-mags from a standing offhand position (no sling) and getting 4" groups at 25 yards. Not great, but almost certainly a reflection on the shooter, and not the equipment!
Thats around what I was getting off hand, no optics (Just irons), standing at ~25yrds...

shadow65
04-22-2011, 6:13 PM
Hey Shadow...whats the price on a complete upper??

Been thinking bout these for a while...mabye it's time!

IM sent;)

rocketsci
05-09-2011, 11:15 PM
Just in case anyone is interested:

I (finally) made it to the range this past weekend, and adjusting the front sight post did indeed work. Too well. Instead of shooting 4" high, its shooting 3" low now. And, of course, I forgot to bring my Leatherman to adjust it.

Darn. I ~have~ to go to the range again.

:)