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Posted: 8/27/2024 2:59:23 PM EDT
Title sums it up. I recently purchased a pair of AP5-Ps and my first suppressor. I've purchased an SBT5K folding brace as well as Lee Sporting AR-style AL lower (so I can use a Super Safety). I'm looking to flesh out the gun a bit. An optic is high on my list.
I'm leaning towards the UTG Pro K size rail / handguard. Is there a reputable optic that can can co-witness with this handguard? If not, what are options for a red/green dot sight that also allow the use of the irons? I'm 48 and I've got light astigmatism, so something that doesn't create a "cluster of red dots" would be great. Unlike an AR, I feel the MP5 is largely a 50yd gun so different zoom levels and such isn't as big of an issue. I'm not familiar with the MP5 platform like I am with the AR platform. It looks like your options on the MP5 are co-witness optic, high-mount optic (allowing line of sight to the irons below the optic), or quick-release to remove the optic. Are there other options that I'm missing? I'm going to be ordering a #28 locking piece to use with the suppressor. I'd like to put a light on the gun, which is part of the reason for the UTG hand guard. I'm curious if there are "must do" MP5 things that I'm missing (from a functional standpoint). Keeping it as a pistol, not SBR. |
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Posted: 8/27/2024 3:09:08 PM EDT
[#1]
I've got the Midwest Industries mount on my ap5-p, red dot on a pretty tall riser. I gave up with co-witnessing the irons, they are comically low. Pulling the optic off if I need the irons is simple.
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Posted: 8/27/2024 4:07:28 PM EDT
[#2]
Quote HistoryOriginally Posted By Pariah762: I've got the Midwest Industries mount on my ap5-p, red dot on a pretty tall riser. I gave up with co-witnessing the irons, they are comically low. Pulling the optic off if I need the irons is simple. |
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Posted: 8/27/2024 6:59:06 PM EDT
[#3]
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Posted: 8/27/2024 7:14:31 PM EDT
[#4]
Lots of mags and ammo.
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FL, USA
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Posted: 8/27/2024 7:24:47 PM EDT
[#5]
Quote HistoryWould one need extractor springs if they upgrade to the Lee Sporting Trigger pack/lower? |
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Posted: 8/28/2024 3:58:16 AM EDT
[#6]
Watch these videos:
 HK SP5 before your first trip to the range mp5 heckler & koch h&k  HK SP5 #1 Maintenance Item Must Know Don't be a Noob h&k heckler & koch mp5 sp5k  MP5 Reloads: Techniques and the WHY w/ Teufelshund Tactical  The why behind not loading your MP5 with the bolt forward |
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LA, USA
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Posted: 8/30/2024 8:57:02 AM EDT
[#7]
I ordered a new RCM locking piece, suppressor, spare springs and mags.
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Posted: 8/30/2024 9:25:02 AM EDT
[#8]
Get a couple German HK mags + MKE mags.
Skip Korean KCI mags altogether. |
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USA
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Posted: 8/30/2024 10:59:27 AM EDT
[#9]
Don't forget to check bolt gap after changing out the locking piece.
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Posted: 8/30/2024 1:57:41 PM EDT
[#10]
I don't think any Optic will get true cowitness with that UTG.
However I do recommend a Holosun K on a Shield Arms style mount. |
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Posted: 8/30/2024 2:02:24 PM EDT
[#11]
Quote HistoryOriginally Posted By lil_Sig: I don't think any Optic will get true cowitness with that UTG. However I do recommend a Holosun K on a Shield Arms style mount. |
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Posted: 8/30/2024 3:22:48 PM EDT
[#12]
Quote HistoryOriginally Posted By motoguy: In conjunction with the UTG, or in place of the UTG? Quote HistoryOriginally Posted By motoguy: Originally Posted By lil_Sig: I don't think any Optic will get true cowitness with that UTG. However I do recommend a Holosun K on a Shield Arms style mount. I Recommend the optic set up without the UTG. Then you can achieve 100% True cowitness |
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Posted: 8/30/2024 3:27:44 PM EDT
[Last Edit: lil_Sig]
[#13]
You can easily modify the shield arms mount To fit The 407 and 507 k Holosuns, and the EPS Holosuns this is what I did.
Not my Pic  Attached FileHK Parts Sells a knock off of that design that will accept the larger 507C https://hkparts.net/all-parts/hkp-hk-mp5-mp5k-universal-optic-mount-black/ |
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MI, USA
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Posted: 8/31/2024 12:10:09 PM EDT
[#14]
Quote HistoryOriginally Posted By lil_Sig: I Recommend the optic set up without the UTG. Then you can achieve 100% True cowitness Zero reason for absolute cowitness unless you just want it for some reason. Using a Holosun 503 with the mount that’s “open” in the middle, I can use the irons under the red dot if I wish. |
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Posted: 9/1/2024 8:38:24 AM EDT
[Last Edit: mini14jac]
[#15]
Quote HistoryOriginally Posted By lil_Sig: You can easily modify the shield arms mount To fit The 407 and 507 k Holosuns, and the EPS Holosuns this is what I did. Not my Pic https://www.ar15.com/media/mediaFiles/575474/1000004881_jpg-3308867.JPG HK Parts Sells a knock off of that design that will accept the larger 507C https://hkparts.net/all-parts/hkp-hk-mp5-mp5k-universal-optic-mount-black/ Something like this might be the best option for an optic on a K sized gun. There’s not a lot of room on top. I had the PTR with the built-in small rail and I still caught my knuckle on it occasionally. Maybe other owners can chime in, but I wouldn’t be happy with the standard claw mount. You gonna bleed bro. Keep Bandaids in your range bag. I sold my PTR last summer. I had the locking piece, correct bolt gap, cool Magpul handguard to protect my hand from the hot trunion, HK trigger housing, etc. But, if the Super Safety had been available then I would have kept it. Now I’m seriously considering another one. |
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Posted: 9/1/2024 9:00:16 AM EDT
[#16]
Quote HistoryOriginally Posted By mini14jac: I sold my PTR last summer. I had the locking piece, correct bolt gap, cool Magpul handguard to protect my hand from the hot trunion, HK trigger housing, etc. But, if the Super Safety had been available then I would have kept it. Now I'm seriously considering another one. The SS is literally the reason I purchased mine. I always wanted an MP5 but it lost most of it's attraction unsuppressed, with a weird long rifle barrel, or with semi fire only. Braces fix the odd long barrel issue and now the SS fixes the high rate of fire issue. Not only did the SS cause the purchase of my first MP5 (well, two...a pair of AP5-P), but I also purchased my first suppressor. That $80 SS cost me a fortune. |
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TX, USA
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Posted: 9/1/2024 10:03:52 AM EDT
[#17]
Quote HistoryI bought some LPs, but can't remember if I got them for my MP5s or my PTR91 and/or 32. I need to get some extractor and springs for sure. |
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Posted: 9/2/2024 8:52:26 AM EDT
[#18]
Quote HistoryOriginally Posted By drobs: Get a couple German HK mags + MKE mags. Skip Korean KCI mags altogether. Agreed. |
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USA
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Posted: 9/2/2024 9:14:51 AM EDT
[#19]
I tried the 80 degree locking piece. But it caused cycling issues with suppressor. So I went back to the standard one. Works great now with or without suppressor.
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Posted: 9/2/2024 11:53:37 AM EDT
[#20]
An earlier post mentioned getting spare springs. I just want to specify, get some extractor springs. They are a wear item.
4 would be a good number to start with. https://hkparts.net/all-parts/fmp-mp5-mp5k-extractor-spring/ https://hkparts.net/all-parts/h-k-mp5-sp5-mp5k-sp5k-9mm-extractor-spring/ |
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PA, USA
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Posted: 9/2/2024 6:14:20 PM EDT
[#21]
Quote HistoryOriginally Posted By ar15joe: Would one need extractor springs if they upgrade to the Lee Sporting Trigger pack/lower? That has nothing to do with the bolt, so yes get some HK extractor spring’s. |
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IN, USA
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Posted: 9/2/2024 6:51:01 PM EDT
[#22]
I find the KCI mag bashing odd. All my 30s are MKE, but I’ve got two KCI 20s I’ve run a ton of rounds through with zero issues.
Of course that’s based on my very limited sample size. |
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Posted: 9/3/2024 8:18:51 AM EDT
[#23]
I've got a decent number of KCI mags. No issues so far. Honestly can't tell them apart from my MKE mags unless I look for the markings.
I know KCI had issues with weak springs in the past. That hasn't been the case for a while. |
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Posted: 9/3/2024 8:56:44 AM EDT
[#24]
KCI gen 2 mags have been flawless for me for hundreds of rounds through each mag, I believe there were issues with gen 1 mags.
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FL, USA
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Posted: 9/3/2024 1:03:47 PM EDT
[#25]
Quote HistoryOriginally Posted By arjohnson: That has nothing to do with the bolt, so yes get some HK extractor spring’s. Quote HistoryOriginally Posted By arjohnson: Originally Posted By ar15joe: Would one need extractor springs if they upgrade to the Lee Sporting Trigger pack/lower? That has nothing to do with the bolt, so yes get some HK extractor spring’s. OK - I heard the Lee Sporting lower allowed lockback on empty mags so may interact with the bolt differently |
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Posted: 9/4/2024 4:37:55 AM EDT
[#26]
Quote HistoryOriginally Posted By Steiner43: I find the KCI mag bashing odd. All my 30s are MKE, but I’ve got two KCI 20s I’ve run a ton of rounds through with zero issues. Of course that’s based on my very limited sample size. I have 3 Zenith Marked KCI mags that are failure to feed inducing garbage. But... I would really like 2 x 20rd mags and will try the gen 2's based on these recommendations. |
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Posted: 9/6/2024 9:32:49 AM EDT
[#27]
Quote HistoryOriginally Posted By seamasterpro: KCI gen 2 mags have been flawless for me for hundreds of rounds through each mag, I believe there were issues with gen 1 mags. KCI mags were great in my PTR, as well as HK, ETS, POF, and Overwatch Precision. But the guy I sold it to says it won’t work with MKE mags.?? |
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Posted: 9/6/2024 9:35:15 AM EDT
[#28]
Quote HistoryOriginally Posted By motoguy: The SS is literally the reason I purchased mine. I always wanted an MP5 but it lost most of it's attraction unsuppressed, with a weird long rifle barrel, or with semi fire only. Braces fix the odd long barrel issue and now the SS fixes the high rate of fire issue. Not only did the SS cause the purchase of my first MP5 (well, two...a pair of AP5-P), but I also purchased my first suppressor. That $80 SS cost me a fortune. I would love to hear how the SS works. You can IM me if you want. A lot of guys don’t want to talk about the SS online. |
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Posted: 9/6/2024 9:51:33 AM EDT
[#29]
Quote HistoryOriginally Posted By mini14jac: I would love to hear how the SS works. You can IM me if you want. A lot of guys don’t want to talk about the SS online. Quote HistoryOriginally Posted By mini14jac: Originally Posted By motoguy: The SS is literally the reason I purchased mine. I always wanted an MP5 but it lost most of it's attraction unsuppressed, with a weird long rifle barrel, or with semi fire only. Braces fix the odd long barrel issue and now the SS fixes the high rate of fire issue. Not only did the SS cause the purchase of my first MP5 (well, two...a pair of AP5-P), but I also purchased my first suppressor. That $80 SS cost me a fortune. I would love to hear how the SS works. You can IM me if you want. A lot of guys don’t want to talk about the SS online. I'm also curious as to what all is needed to run a SS in an AP5. This company makes a knock off (3d printed?) Lee Sporting Lower. https://skoprints.com/shop/ They also sell this SS sear trip, but is it needed? https://skoprints.com/product/mp5k-super-safety-trip/ |
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NC, USA
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Posted: 9/6/2024 4:24:04 PM EDT
[#30]
My advice is don’t screw with it until you’ve shot it quite a bit.
Way too many people order or buy a gun and then decide they need to “upgrade” it before they even shoot it. And of course they listen to internet experts who insist well proven forearms like the MP-5 family. —— I can’t speak to the short barreled P version but the standard AP-5 is quite accurate for the type when properly set up. This is a pretty typical 50 yard group using a Holosun 507C cowitnessed (lower third) to the sights.  This is a typical 100 yard group.  HK parts sells a clamp on mount for the AP5 that will mount a Holosun 507C low enough to cowitness with the iron sights. That’s a good thing not just for backup purposes but also for accuracy as you can consistently place the dot on top of the front sight post and eliminate any parallax, greatly improving accuracy, 
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Posted: 9/6/2024 5:05:34 PM EDT
[Last Edit: ToyCop]
[#31]
the Infitech mount on my SP5 will cowitness if you use a ACRO or The T2 version. For the K, I picked up a Gibbous Outfitters light mount (not pictured) that attaches to the front sight post. They also offer hand guards with SureFire switch cutouts.
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Posted: 9/9/2024 2:08:56 PM EDT
[#32]
What type of mount is needed to keep the irons functional with the UTG Pro mount while also mounting a red dot? I'm assuming an elevated / see through (non co-witness) mount, but I'm curious about the thickness of attaching to the top rail and not obscuring the irons.
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Posted: 9/9/2024 2:33:28 PM EDT
[#33]
Quote HistoryOriginally Posted By motoguy: What type of mount is needed to keep the irons functional with the UTG Pro mount while also mounting a red dot? I'm assuming an elevated / see through (non co-witness) mount, but I'm curious about the thickness of attaching to the top rail and not obscuring the irons. |
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Posted: 9/10/2024 8:33:49 PM EDT
[#34]
Well, following this, since I just ordered my AP5-P today. I got incredibly lucky in that not only did I find one of the VERY hard to find SB braces, it was local and I got a discount.
Figuring out a single claw mount and smaller red dot for it now. I may go ahead and swap for a proper barrel sight for it. I don't like the notched one. |
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Posted: 9/13/2024 5:08:27 PM EDT
[#35]
This thread has my attention...
Just picked up my AP5p and Omega 9k the other day. Have an RCM #28 80° locking piece, a Midwest Industries MP5 K pic mount, and a Magpul safety on the way. And I got a Sig Romeo5 Gen II in the mail today to mount on it. Waiting on the locking piece before I go and shoot it, make sure every things gtg... Then off to engraving. Annnnnd then it'll get a B&T MP5k side folder and HK vert grip forend. I really hope it'll run Federal syntech 150s, fingers crossed it doesn't hate flat nosed rounds! 🤞  |
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Posted: 9/13/2024 5:12:59 PM EDT
[#36]
Quote HistoryOriginally Posted By slowkota1: This thread has my attention... Just picked up my AP5p and Omega 9k the other day. Have an RCM #28 80° locking piece, a Midwest Industries MP5 K pic mount, and a Magpul safety on the way. And I got a Sig Romeo5 Gen II in the mail today to mount on it. Waiting on the locking piece before I go and shoot it, make sure every things gtg... Then off to engraving. Annnnnd then it'll get a B&T MP5k side folder and HK vert grip forend. I really hope it'll run Federal syntech 150s, fingers crossed it doesn't hate flat nosed rounds! 🤞 https://i.imgur.com/1e9rDsn.jpg I have the exact same set up and it doesn't run syntech |
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Posted: 9/13/2024 6:21:39 PM EDT
[#37]
Quote HistoryOriginally Posted By weapons_free: I have the exact same set up and it doesn't run syntech That sucks... Glock food I guess 
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Posted: 9/15/2024 9:38:56 AM EDT
[#38]
Quote HistoryOriginally Posted By drobs: I have 3 Zenith Marked KCI mags that are failure to feed inducing garbage. But... I would really like 2 x 20rd mags and will try the gen 2's based on these recommendations. Quote HistoryOriginally Posted By drobs: Originally Posted By Steiner43: I find the KCI mag bashing odd. All my 30s are MKE, but I’ve got two KCI 20s I’ve run a ton of rounds through with zero issues. Of course that’s based on my very limited sample size. I have 3 Zenith Marked KCI mags that are failure to feed inducing garbage. But... I would really like 2 x 20rd mags and will try the gen 2's based on these recommendations. Received 2 gen 2 KCI 20rd mags. Loaded them with 20rds and... Last round failure to feeds with both mags.  I'm sticking with my original statement AVOID all KCI mags. |
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Posted: 9/15/2024 11:25:57 AM EDT
[#39]
Quote HistoryOriginally Posted By drobs: Received 2 gen 2 KCI 20rd mags. Loaded them with 20rds and... Last round failure to feeds with both mags. I'm sticking with my original statement AVOID all KCI mags. The KCI "Zenith" branded mags that came with my two ZF-5 and ZF5-P have an issue the third round from the bottom (2 left in mag) gets loose then causes a traffic jam in the ejection port the brass doesn't get ejected, the round gets in the way AND the bolt tries to strip the next round... Pretty much every time on all 6 KCI/ZENITH mags... also of note the bolt is hitting the top of the feed lips this is perhaps slightly normal but leads me to believe that there is an issue with the feed lip geometry. |
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Posted: 9/15/2024 11:31:29 AM EDT
[#40]
Quote HistoryOriginally Posted By slowkota1: That sucks... Glock food I guess Or one of my suppressed sbr ar9s |
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OH, USA
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Posted: 9/15/2024 6:00:24 PM EDT
[#41]
Quote HistoryOriginally Posted By drobs: Received 2 gen 2 KCI 20rd mags. Loaded them with 20rds and... Last round failure to feeds with both mags. I'm sticking with my original statement AVOID all KCI mags. Funny how my genuine HK mags work flawless in my HK SP5 and SP5K-PDW. OBTW, that's called a clue to you clone types. 
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Posted: 9/16/2024 8:19:44 AM EDT
[#42]
Quote HistoryOriginally Posted By HK-Slap: Funny how my genuine HK mags work flawless in my HK SP5 and SP5K-PDW. OBTW, that's called a clue to you clone types. Quote HistoryOriginally Posted By HK-Slap: Originally Posted By drobs: Received 2 gen 2 KCI 20rd mags. Loaded them with 20rds and... Last round failure to feeds with both mags. I'm sticking with my original statement AVOID all KCI mags. Funny how my genuine HK mags work flawless in my HK SP5 and SP5K-PDW. OBTW, that's called a clue to you clone types. Maybe you can talk to HK and get them to make us some 20rd mags. What was HK thinking with 15rd mags? Fucking Germans... My MKE 30rd mags have been flawless in my AP5 along with my 30rd HK mags. |
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Posted: 9/16/2024 8:29:16 AM EDT
[Last Edit: MudEagle]
[#43]
Quote HistoryOriginally Posted By HK-Slap: OBTW, that's called a clue to you clone types. Things built under license are not "clones". For all of you who have KCI USA mags that don't work correctly, they have a lifetime replacement warranty. If you don't want to go through that hassle, send 'em to me, I'll pay postage. |
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OH, USA
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Posted: 9/16/2024 1:36:42 PM EDT
[#44]
Quote HistoryOriginally Posted By drobs: Maybe you can talk to HK and get them to make us some 20rd mags. What was HK thinking with 15rd mags? Fucking Germans... My MKE 30rd mags have been flawless in my AP5 along with my 30rd HK mags. What are you hating on 15rd mags? |
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OH, USA
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Posted: 9/16/2024 1:40:43 PM EDT
[#45]
Quote HistoryOriginally Posted By MudEagle: Things built under license are not "clones". For all of you who have KCI USA mags that don't work correctly, they have a lifetime replacement warranty. If you don't want to go through that hassle, send 'em to me, I'll pay postage. A Mitsubishi built F15 and a SABCA built F16 are clones of the originals. |
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Posted: 9/17/2024 1:45:45 PM EDT
[#46]
Quote HistoryOriginally Posted By HK-Slap: A Mitsubishi built F15 and a SABCA built F16 are clones of the originals. Both built under license from the manufacturer, so...no. |
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OH, USA
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Posted: 9/17/2024 3:05:10 PM EDT
[#47]
Quote HistoryOriginally Posted By MudEagle: Both built under license from the manufacturer, so...no. Actually... yes, and you are wrong because your argument is the exact same on the cloners use... licensed by HK using HK tooling with workers trained by HK personnel... exactly how licensed built aircraft are manufactured. |
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Posted: 9/17/2024 3:13:08 PM EDT
[Last Edit: MudEagle]
[#48]
Quote HistoryOriginally Posted By HK-Slap: Actually... yes, and you are wrong because your argument is the exact same on the cloners use... licensed by HK using HK tooling with workers trained by HK personnel... exactly how licensed built aircraft are manufactured. Uh, what? A "clone" is something like a DJ Goetz or a Todd Bailey or a Ghilliebear -- makers who have no relation to HK and no permission from the manufacturer to make theirs. A licensed-produced model is made with the permission of, and a licensing fee paid to, the original manufacturer...like MKE, POF, EBO and Pyrkal in Greece, FMP in Portugal, etc. There is a Grand Canyon's worth of difference between the two. One is a "clone", one is "produced under license." Just like the many trainer and fighter aircraft that are produced under license by other manufacturers in other countries. Words mean stuff in the English language. |
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OH, USA
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Posted: 9/17/2024 7:12:10 PM EDT
[#49]
Quote HistoryOriginally Posted By MudEagle: Uh, what? A "clone" is something like a DJ Goetz or a Todd Bailey or a Ghilliebear -- makers who have no relation to HK and no permission from the manufacturer to make theirs. A licensed-produced model is made with the permission of, and a licensing fee paid to, the original manufacturer...like MKE, POF, EBO and Pyrkal in Greece, FMP in Portugal, etc. There is a Grand Canyon's worth of difference between the two. One is a "clone", one is "produced under license." Just like the many trainer and fighter aircraft that are produced under license by other manufacturers in other countries. Words mean stuff in the English language. If it's not OEM, it's a clone. |
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Posted: 9/17/2024 7:59:59 PM EDT
[#50]
Quote HistoryOriginally Posted By HK-Slap: If it's not OEM, it's a clone. Gee, I can't wait for another 250 posts of you saying the same thing. |
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