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9/13/2026 3:50:31 PM EDT
I have a full size AP5, works very well with fmj's, With the FRT and without. Gold dots and HST's no matter the grain fail to load. Any recommendations for a defensive round that you have had luck with cycling?
9/13/2026 3:52:43 PM EDT
[#1]
Fiocchi Defense Dynamics 124 JHP.

Went through this myself.  The shape of that round works really really well in the MP5 style platform.  Honestly, not sure how it performs ballistically, but its better than ball.
9/13/2026 11:34:27 PM EDT
[Last Edit: SSeric02][Edited] [#2]
I had the same issue and swapped out the magazine catch for an HK part (part # 214858). Measuring the original AP5 and HK parts found the AP5 mag catch was slightly undersized in several dimensions. With the HK mag catch installed, my AP5 cycled HSTs, Gold Dots, and Federal Syntech without issue. Just the little difference in mag height appears to have made the difference.
9/14/2026 12:39:35 PM EDT
[#3]
I had mixed luck with HST 147s, they did fairly well in an HK mag. You might try Hornady Critical Duty/Defense as the polymer tip might help?
9/14/2026 1:14:33 PM EDT
[#4]
Quote History
Originally Posted By bluedog82:
I had mixed luck with HST 147s, they did fairly well in an HK mag. You might try Hornady Critical Duty/Defense as the polymer tip might help?
View Quote


Hornady did terrible in my AP5's.

I had the exact same thought, and figured that would be a perfect match for these things due to the aggressive taper of the bullet.

Did not work well for me.

I genuinely tried everything I could get my hands on, and Fiochhi was the only one that ran perfectly.
9/14/2026 1:17:28 PM EDT
[#5]
Quote History
Originally Posted By SSeric02:
I had the same issue and swapped out the magazine catch for an HK part (part # 214858). Measuring the original AP5 and HK parts found the AP5 mag catch was slightly undersized in several dimensions. With the HK mag catch installed, my AP5 cycled HSTs, Gold Dots, and Federal Syntech without issue. Just the little difference in mag height appears to have made the difference.
View Quote


Very interesting.  Unfortunately I can't find a single place that has these in stock.  I'll keep my eyes open.  I'd love to get these things to run gold dots.
9/14/2026 5:01:19 PM EDT
[#6]
Quote History
Originally Posted By Marksman14:
Very interesting.  Unfortunately I can't find a single place that has these in stock.  I'll keep my eyes open.  I'd love to get these things to run gold dots.
View Quote View All Quotes
View All Quotes
Quote History
Originally Posted By Marksman14:
Originally Posted By SSeric02:
I had the same issue and swapped out the magazine catch for an HK part (part # 214858). Measuring the original AP5 and HK parts found the AP5 mag catch was slightly undersized in several dimensions. With the HK mag catch installed, my AP5 cycled HSTs, Gold Dots, and Federal Syntech without issue. Just the little difference in mag height appears to have made the difference.
Very interesting.  Unfortunately I can't find a single place that has these in stock.  I'll keep my eyes open.  I'd love to get these things to run gold dots.
FWIW to you, HKParts has the 'latest' style one piece catch in stock.  Note that it does NOT say it's an OEM part, but it does say it's sourced from Germany.

Mag Catch


ZIB also has them in stock, but getting one from Germany to the States is a whole other can of worms.

https://zib-militaria.de/MP5-magazine-holder-HK-214858  Note the difference in construction between the two.

Now with more political fatigue.

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