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Posted: 9/26/2016 7:51:04 PM EDT
[#1]
What ammo were you using?
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Posted: 9/26/2016 7:55:13 PM EDT
[#2]
I forgot the name of the MFG. it was some cheap Walmart range ammo. The ammo grouped very tight though. 115 gr fmj
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Posted: 9/26/2016 8:38:16 PM EDT
[#3]
Once upon a time I was thinking POI shift mattered, but now I never shoot unsuppressed...
JPK |
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Posted: 9/26/2016 8:47:53 PM EDT
[#4]
I guess you are right. The can will live on the rifle (when it gets out of jail), just wanted to be sure there wasn't something wrong with my set up.
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Posted: 9/27/2016 8:05:13 AM EDT
[#5]
6 inches at 25 yards is a little much -- it is 24 inches at 100 yards, and probably beyond the adjustment range of most optics. I would suggest checking alignment with the suppressor on the gun, as it sounds like the bullet may be barely grazing the front end cap.
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Posted: 9/27/2016 10:21:06 AM EDT
[#6]
That seems a little excessive, my Griffin will shift my 11.5" barrel POI 3" at 50 yds.
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Posted: 9/27/2016 11:12:55 AM EDT
[#7]
I have found POI shift to depend more on specific barrels than I do rigidity of the barrel, or the suppressor, or the muzzle device, or whatever else.
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Posted: 9/27/2016 9:15:47 PM EDT
[#8]
I forgot to mention that I'm using an HK 3lug mount for my Omega 9k. I wonder if there might be some issue with the mounting interface that could be causing my POI shift. Any suggestions?
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Posted: 9/29/2016 8:38:46 PM EDT
[#9]
I was able to visit my Omega 9K in jail again today to try and figure out why I was getting such extreme POI shift. When I mounted the 9k onto the Sig MPX via the HK parts 3 lug adapter there was noticeable play. I called SiCo and was told by Quentin that some play/wiggle is inherent in all 3 lug designs. I removed the 3 lug adapter and used my direct thread attachment and Eureka, there was no noticeable POI shift at all. I already paid $140 for the SiCo Octane 3 lug mount and I really want to be able to use the 3 lug mounting system. Since it looks like the HK parts MPX 3 lug adapter caused my POI shift issue, is there another 3 lug adapter that might be better?
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Posted: 9/29/2016 9:01:18 PM EDT
[#10]
Quote HistoryQuoted:
I was able to visit my Omega 9K in jail again today to try and figure out why I was getting such extreme POI shift. When I mounted the 9k onto the Sig MPX via the HK parts 3 lug adapter there was noticeable play. I called SiCo and was told by Quentin that some play/wiggle is inherent in all 3 lug designs. I removed the 3 lug adapter and used my direct thread attachment and Eureka, there was no noticeable POI shift at all. I already paid $140 for the SiCo Octane 3 lug mount and I really want to be able to use the 3 lug mounting system. Since it looks like the HK parts MPX 3 lug adapter caused my POI shift issue, is there another 3 lug adapter that might be better? Manticore arms makes one. I'm not sure if it's any better or worse. |
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Posted: 9/29/2016 9:56:21 PM EDT
[#11]
I guess the SiCo Octane 3 lug mount could be the problem
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Posted: 9/30/2016 1:56:48 AM EDT
[#12]
I have a 4 inch shift with my guns at 100 yards with my Saker 7.62. At least it's consistent across all the guns I use it on.
The Saker is one heavy SOB, but built like a tank. |
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Posted: 9/30/2016 5:55:25 AM EDT
[#13]
Quote HistoryQuoted:
Once upon a time I was thinking POI shift mattered, but now I never shoot unsuppressed... JPK This. You have suppressed weapon you are going to run suppressed 95% of the time. Sight in with suppressor on *poof* No more POI shift |
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Posted: 9/30/2016 8:10:05 AM EDT
[#14]
Quote HistoryQuoted:
This. You have suppressed weapon you are going to run suppressed 95% of the time. Sight in with suppressor on *poof* No more POI shift Quote HistoryQuoted:
Quoted:
Once upon a time I was thinking POI shift mattered, but now I never shoot unsuppressed... JPK This. You have suppressed weapon you are going to run suppressed 95% of the time. Sight in with suppressor on *poof* No more POI shift This is excellent advice for a POI shift due to altering barrel harmonics by adding the weight of a suppressor. It is not good advice if the shift is due to baffle or endcap contact due to misalignment. The way to tell the difference is to shoot a 10-round group from a rest. Harmonic shift will maintain a decent group size. If the group more than doubles in size, then suspect a misalignment error. |
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Posted: 9/30/2016 1:33:12 PM EDT
[#15]
My Tirant with 3 lug and MP5K clone shifts a little more than I wish it did as well.
But its not as drastic as you say. Id say a 3 inches low and left at 25 yards. It makes things get pretty squirrely at range. My pistol also has a good amount of shift in the same direction. Throw in on a bolt gun and it doesn't shift at all. Suppressors are a weird mistress |
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Posted: 9/30/2016 2:01:26 PM EDT
[#16]
Look at how the 3 lug adapter fits on the barrel, MPX is taper rather than a really strong shoulder, so you could have issues where the adapter isn't on there properly.
I've seen one MPX barrel screwed by a 3-lug that didn't fit it right. |
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Posted: 9/30/2016 11:01:00 PM EDT
[#17]
Quote HistoryQuoted:
Manticore arms makes one. I'm not sure if it's any better or worse. Quote HistoryQuoted:
Quoted:
I was able to visit my Omega 9K in jail again today to try and figure out why I was getting such extreme POI shift. When I mounted the 9k onto the Sig MPX via the HK parts 3 lug adapter there was noticeable play. I called SiCo and was told by Quentin that some play/wiggle is inherent in all 3 lug designs. I removed the 3 lug adapter and used my direct thread attachment and Eureka, there was no noticeable POI shift at all. I already paid $140 for the SiCo Octane 3 lug mount and I really want to be able to use the 3 lug mounting system. Since it looks like the HK parts MPX 3 lug adapter caused my POI shift issue, is there another 3 lug adapter that might be better? Manticore arms makes one. I'm not sure if it's any better or worse. I got mine from http://www.trosusa.com/ |
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Posted: 10/1/2016 11:07:01 AM EDT
[#18]
Quote HistoryQuoted:
Once upon a time I was thinking POI shift mattered, but now I never shoot unsuppressed... JPK Samesies, when I first got into suppressors this was a thing I worried about. I've since found that I always use suppressors on mine set up for them, and (duh) always don't on those not set up for them; so it's actually been a complete non-issue. Either way, as long as any POI shift is repeatable, I wouldn't worry. |
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