My experience with HK45/HK45C magazine extensions
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Thread: My experience with HK45/HK45C magazine extensions

  1. #1
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    Default My experience with HK45/HK45C magazine extensions

    First, I've carried the HK45 as my primary duty handgun since it was released in 2006-2007. I've also carried the HK45C as my secondary/back-up since it's release in 2007-2008. My daily uniform gear included carrying both of these handguns. In 2014 I returned to a plain clothes assignment, resulting in carrying just the HK45C, in a concealed carry manner.

    REGADING MAG EXTENSIONS:
    I've posted several times in the past regarding magazine extensions for the HK45 & HK45C, mostly the HK45. To that end, I've been using the Taylor Freelance (TF) +3 extensions for a few years now. I chose to load the +3 extensions to a total of 12 rounds, and this is how I've carried them for the past few years. I've had no malfunction with them, but I've noticed they don't fall freely when empty as easily as OEM magazines. I found this odd because the extension bases weigh considerably more than the plastic OEM mag bases. I've also not been happy with the significant gap between the extension shoulder and the base of the grip/mag well, as I'm concerned with over insertion and damaging the ejector as others have discovered (with the P30). With the concern of over insertion, I've taken care to not SLAM magazines into my gun. Despite the two issues I've noted, I want to reiterate, I HAVE EXPERIENCED ZERO MALFUNCTIONS WITH THE TF EXTENSIONS.

    Now, by dumb luck I happened to connect with the owner of TF IN 2016'ish right when he was working on an upgrade to his HK45 extension (version 2.0 if you will). We exchanged thoughts and I explained my concerns. TF made improvements to his product, but did not include my suggestions. During this time I discovered why (I think?) the TF equipped magazines the mounting groove is cut parallel to the flat base, resulting in the base not being parallel to the mag well when inserted (refer to pics), causing leverage on the magazine in the mag well.

    Fast forward to 2017 and HKPARTS releases their HK45C +2 extension. And with the HK45C extension HKPARTS reported they would be releasing extensions for the full size as well, this has yet to materialize. Now, I've never understood the need for a 45C +2 extension, as the OEM Elephant Foot mags preform this task flawlessly, albeit not the most elegant in appearance. That said, I was curious if they'd work with the full size. So I ordered a couple, and they arrived yesterday. Let me say the machine work on these looks good, and the finish looks good as well. They fit full size magazines, and the mag inserts. The mag with the HKPARTS extension drops freely as an OEM mag does, I think this is because the mounting groove is cut in at an angle, resulting in the mag base being parallel to the mag well when inserted (picture). All this is great, but there is still a significant gap between the base of the grip/mag well and the shoulder of the extension. This could easily (I think?) be corrected by machining a taller shoulder onto the extension. I would love to see them release a 2 or 3 round full-size extension that is similar in shape as the 45C extension, as I'm not interested in a higher capacity extension. I'm scheduled to be at the range all this week for training, and plan to run the HKPARTS extensions through their paces. I'll report back on reliability.


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  2. #2
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    Great feedback. Thank you and thank you for your service.
    Marty
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    Interesting, thanks for taking the time.

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    Ok, so I had some time, not much unfortunately, to run some rounds through these mags. thus far, smooth like butta'. no malfunctions. I've tried shooting them in anyway I can think of to try and cause the magazine to fail, but so far none. They definitely fall free better, or as the OEM mags do, in comparison to the TF extensions which seem to hang up. I have two more days out at the range this week (most of my time is teaching), I will continue to run rounds through these mags. One thing I noticed, which is not a negative as all/any aluminum extension has this issue, the aluminum bases/extensions don't like to fall onto concrete/asphalt. If HKPARTS offers a full size version which eliminates the gap between the base of the mag well and the top shoulder of the extension, I will likely buy several. If this happens, I may look for some type of adhesive pad to attach to the bottom of the extension, but that is only a thought at this point.

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    I'm going to revive this old thread. I just got two of the HKParts HK45 3 round extensions. I've not had a chance to shoot them yet, just got them last night and installed them on two mags. I will also add some pic's later (tonight maybe). However, that said, the fit/finish of these extensions is excellent. The new method of securing the extension to the mag body is pretty innovative, at least in my opinion, but I'm certainly not a design engineer or anything like that.

    I was very pleased to see that HKParts ensured the shoulder of the extension acts as a stop, preventing over-insertion and the resulting potential damage to the ejector. The extensions fit the profile of the mag well, very well, and look appropriate.

    As I've do with the other +3 extensions, I load mine to 12 rather than 13. I was able to get the 13th round in without any issue. However there is no compression left in the magazine, and would likely make Tac re-loads troublesome.

    I am scheduled to be at the range most of next week. I will run these mags hard and see if I can induce any kind of failure, although I don't think I will be able to do so.

    On a side note, I like the red anodized option, although that would not be appropriate for work. none the less, I may pick up one or two of them anyway?

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    Quote Originally Posted by LCSO264 View Post
    I'm going to revive this old thread. I just got two of the HKParts HK45 3 round extensions. I've not had a chance to shoot them yet, just got them last night and installed them on two mags. I will also add some pic's later (tonight maybe). However, that said, the fit/finish of these extensions is excellent. The new method of securing the extension to the mag body is pretty innovative, at least in my opinion, but I'm certainly not a design engineer or anything like that.

    I was very pleased to see that HKParts ensured the shoulder of the extension acts as a stop, preventing over-insertion and the resulting potential damage to the ejector. The extensions fit the profile of the mag well, very well, and look appropriate.

    As I've do with the other +3 extensions, I load mine to 12 rather than 13. I was able to get the 13th round in without any issue. However there is no compression left in the magazine, and would likely make Tac re-loads troublesome.

    I am scheduled to be at the range most of next week. I will run these mags hard and see if I can induce any kind of failure, although I don't think I will be able to do so.

    On a side note, I like the red anodized option, although that would not be appropriate for work. none the less, I may pick up one or two of them anyway?
    I just happen to be on HKparts a few minutes ago and saw the ones for the USP full-size .45. Looking forward to your photos and review. I plan on getting some too, I would like to see the +3 if it will work good on the 45c.

  8. #7
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    ****PIC HEAVY****

    Ok, so a little refresher. I was looking for a magazine extension for the HK45. I carry it as my primary/duty weapon. I carry my HK45c as my secondary, and my plain clothes carry gun. My current assignment is a plain clothes assignment.

    Regarding the full size extensions, I first found the TF +3 extensions (gen 1). I picked up 2 of the kits that utilize the OEM spring. I only loaded them to 12, because the 13th round was so tight there was no compression left in the magazine. So, for reliability purposes and tactical reload purposes, I chose to load them to 12 (to be fair, TF has recently redesigned the extension, which reportedly has more room for the 13th round). Regarding function, I have not experienced a malfunction in them. That said, I’ve found they don’t always fall free when doing a combat reload. I also noted the shoulder of the extension does not contact the mag well, physically preventing over insertion and possible ejector damage. There is a gap between the shoulder of the mag and the base of the mag well, which allows the mag body to impact the ejector, particularly if the mag is SLAMMED into place. I generally do not slam my mags in, for a variety of reasons.... however, mag over insertion is a concern, it has been discussed in other post here before, however to my knowledge the instances of over insertion discussed here were not with TF +3 extensions. On a side note, I didn’t care for the looks of the method of securing the extension to the mag body, however it is very functional.

    So I’ve carried the TF extensions for quite a while, a couple years. I carry them as my spares, and have not had any issues, other than they sometimes get hung up on combat reloads.

    Next came the HKParts HK45c +2 extensions. I picked up 2 of them. I noted right away these extensions were machined to match/fit the mag well of the HK45c. This meant there is a physical stop, preventing over insertion. I was impressed with the fit/finish and machining of the compact +2 extension. For what it’s worth, I do not have any issues with the OEM Elephant Foot mags, but I will say the HKParts +2 look better and might be slightly shorter than the Elephant Foot mags?

    I installed one +2 extension on a 8 round compact mag. I was impressed with how well the extension mated to the mag well. I was a little unsure about the system they came up with to lock the extension to the mag body. After the extension is installed, you back out 2 Allen heads that prevent the mag body from sliding off the extension. A little lock tight ensures the Allen head doesn’t back out further, or screws down.

    I installed the second one on a full size mag body. I knew it would not match the profile of the full size mag well, as the two mag wells are very different. Not only did it not match up on the full size, there was a significant gap between them, again leaving the potential of over insertion and ejector damage. I ran the mags and encountered one malfunction, however it was the full-size mag body with the compact +2 extender. I’ve not been able to recreate the malfunction.

    Finally, a few weeks ago HKParts released their full size HK45 +3 extensions. I again picked up 2 to test. The first thing I noted was the method these extensions lock to the mag body. Once the extension is slid onto the mag body, small Allen head screws are tight end from the bottom of the extension, which in turn drive two tabs up, which block the mag body from sliding off the extension. Again, the application of lock tight was required, after 100’s of rounds, one of the Allen heads had begun to back out (so I applied lock tight). I was also pleased to see that the shoulder of the extension was high enough that it contacted the mag well, acting as a physical stop, preventing over insertion and potential damage to the ejector.

    I was assigned to be at the range most of last week, which allowed my to run a large volume of ammo through the mags. I ran 100’s through the two mags, and did not experience a single malfunction all week. Again I only loaded them to 12 rounds.

    So, all of the mags ran nearly perfectly, and were essentially as reliable as the OEM mags. The one thing that was consistent among all of the aluminum extensions; they don’t like being dropped onto asphalt. All of then now have signs of combat reloads in the form of gouges and scrapes on the extensions. I’d like to see some kind of adhesive rubber pad that could be put on the bottom, but that is my only suggestion for improvement.

    Overall, so far I am leaning toward the HKParts full size extension. They are bullet and bomb proof, they address the over insertion issue, and I found they fell free during reloads. I could not create a malfunction in them either.
    Attached Thumbnails Attached Thumbnails My experience with HK45/HK45C magazine extensions-ae7d362f-8c82-4dd2-a319-8f35baa69c39.jpeg   My experience with HK45/HK45C magazine extensions-676643b9-208e-4635-adcf-b6862a96f91f.jpeg   My experience with HK45/HK45C magazine extensions-a04c3e95-bf46-4a0f-8b92-118dc5541e19.jpeg   My experience with HK45/HK45C magazine extensions-ab0abae7-9713-4f7c-9556-bd4cd8cea878.jpeg   My experience with HK45/HK45C magazine extensions-2e257509-f10d-4f14-9ec6-7d41b7e1e4ed.jpeg  

    My experience with HK45/HK45C magazine extensions-b5702007-3d00-464a-82d7-360caef39993.jpeg   My experience with HK45/HK45C magazine extensions-21c6a207-41be-466b-bd28-57d98f1797e3.jpeg   My experience with HK45/HK45C magazine extensions-ffb5189f-b74d-4102-89de-dd626fbbc1c5.jpeg   My experience with HK45/HK45C magazine extensions-bace7ea5-42f4-49af-879a-6b9a648aa487.jpeg   My experience with HK45/HK45C magazine extensions-7baa7e98-0e3f-4134-870c-4a06d49f3f72.jpeg  

    My experience with HK45/HK45C magazine extensions-56763d53-9517-4f56-be02-4adb1a6eb18a.jpeg   My experience with HK45/HK45C magazine extensions-ef238fbd-f493-4ba5-ae27-324ba02a0f5a.jpeg   My experience with HK45/HK45C magazine extensions-18f9cf5b-99a7-49c0-9876-fe1e46ddabb7.jpeg   My experience with HK45/HK45C magazine extensions-ae441428-8ad4-4b45-be86-e255eb08065d.jpeg   My experience with HK45/HK45C magazine extensions-a4fe555a-1b3e-425b-9750-9c5b45ad389f.jpeg  

    My experience with HK45/HK45C magazine extensions-9b7965ae-7b65-4d5d-b637-cc5321a18ac9.jpeg   My experience with HK45/HK45C magazine extensions-db1dcd50-c360-42fc-9ccd-f6a2e8596b58.jpeg   My experience with HK45/HK45C magazine extensions-0836d6b0-2328-487c-b53c-ae07c9b3405c.jpeg  
    Last edited by LCSO264; 12-11-2017 at 09:43 AM.

  9. #8
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    Nice work, thanks for the info. You could plasti-dip or Line-X the extensions. When they get scratched up, apply another thin coat or remove and re-apply. Plasti-dip will not peel off but is removable.

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    I wonder how well the HK45c mag release work on my uspc 9mm. Any input?
    My opinions may have changed, but not the fact that I am right.

  11. #10
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    Quote Originally Posted by 4X4 View Post
    Nice work, thanks for the info. You could plasti-dip or Line-X the extensions. When they get scratched up, apply another thin coat or remove and re-apply. Plasti-dip will not peel off but is removable.
    Thanks for the tip, I’d not thought a dipped or painted application.

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