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Posted: 5/16/2017 2:56:49 PM EDT
[#1]
IMI 158 is known bad, at least for earlier HK designs. Reportedly, later guns or those from different manufacturers have different locking piece angles and don't suffer the issue like earlier guns did.
It's not that it's too hot, but that its pressure curve is weird and stresses the extractor spring. Other makers' 158s may be fine because their pressure curves will likely differ from the IMI blue-tip loading, but I don't have direct experience with those. I've never heard of a problem with the 158gr "Special-K" loadings. |
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Posted: 5/16/2017 6:25:27 PM EDT
[#2]
Is there a reason why you want to run/shoot 158s? 147s are going to be subsonic and easier to get. Idk if you reload or not but again, 147s are just easier to get. As far as shooting them through an MP5, i have heard 158s werent good to use, but i havent tried either.
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Posted: 5/16/2017 7:41:41 PM EDT
[#3]
Quote HistoryQuoted:
Is there a reason why you want to run/shoot 158s? 147s are going to be subsonic and easier to get. Idk if you reload or not but again, 147s are just easier to get. As far as shooting them through an MP5, i have heard 158s werent good to use, but i havent tried either. |
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Posted: 5/16/2017 7:53:23 PM EDT
[#4]
Yeah I had some feeding problems with some crappy cheap 147 grain Remington UMC ammo with both my Cohaire Mp5 and MKE Mp5K clones. I think UMC ammo tends to be a bit under powered, which made it quiet suppressed, but doesn't help with cycling, also yeah that flat point round gets jammed up sometimes on the feed ramps. I love the Fiocchi 158 grain ammo with my Mp5, haven't tried it in the Mp5K yet since it has become scarce... But yeah I would probably only shoot the IMI 158 grain stuff in an UZI which can handle just about anything.
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Posted: 5/16/2017 8:03:07 PM EDT
[#5]
Quote HistoryQuoted:
Yeah I had some feeding problems with some crappy cheap 147 grain Remington UMC ammo with both my Cohaire Mp5 and MKE Mp5K clones. I think UMC ammo tends to be a bit under powered, which made it quiet suppressed, but doesn't help with cycling, also yeah that flat point round gets jammed up sometimes on the feed ramps. I love the Fiocchi 158 grain ammo with my Mp5, haven't tried it in the Mp5K yet since it has become scarce... But yeah I would probably only shoot the IMI 158 grain stuff in an UZI which can handle just about anything. |
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Posted: 5/16/2017 11:16:36 PM EDT
[#6]
Quote HistoryQuoted:
Cool! So we got one saying the Fiocchi 158 is GTG. Anyone have any experience with the 158 PPU? |
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Posted: 5/17/2017 3:40:02 AM EDT
[#7]
PPU is good to go or at least it was for me. I was told IMI would lead to roller marks because it was loaded to cycle open bolt guns and the pressure curve is just wrong for roller guns. The PPU is extremely quiet.
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Posted: 5/17/2017 1:56:41 PM EDT
[#8]
I have put 100 rounds of Fiochi 158gr through my Zenith MP5 clone, and several hundred PPU 158gr through it.
No issues with either, this is the first I heard of 158gr issues in MP5's/clones. I do think the 158's are quieter than 147's. |
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Posted: 5/17/2017 2:27:08 PM EDT
[#9]
Quote HistoryQuoted:
I have put 100 rounds of Fiochi 158gr through my Zenith MP5 clone, and several hundred PPU 158gr through it. No issues with either, this is the first I heard of 158gr issues in MP5's/clones. I do think the 158's are quieter than 147's. |
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Posted: 5/18/2017 10:22:29 PM EDT
[#10]
Gerard Miller told me he had seen IMI causing roller marks in the receivers because it was loaded hot with the intention of it being used in UZIs. It's not the projectile weight so much as the pressure and the issue from what I have seen is specific to the IMI 158gr ammo. Stick with standard pressure stuff and you should never have any issues.
Quote HistoryQuoted:
Cool! If I'm not mistaken, what I read was the IWI 158's were meant to cycle the Uzi's heavy bolt but are too powerful(?) for the MP5 series. What I'm not sure about was whether or not other 158's were in the same category. |
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Posted: 5/20/2017 2:29:11 PM EDT
[#11]
Quote HistoryQuoted:
I've put several thousand Fiocchi 158s through my MP5K-N without issue. Spooky quiet with a can attached. Quote HistoryQuoted:
Quoted:
Cool! So we got one saying the Fiocchi 158 is GTG. Anyone have any experience with the 158 PPU? |
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Posted: 5/20/2017 10:15:04 PM EDT
[#12]
Groovy! 1,000 rounds of 158gr Fiocchi ordered!
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