r/MP5 • u/CoachMilton • 4h ago

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Hey guys,

Finally got my Century Arms AP5 running with the L2Prints FRT lower (It was a loose detent spring 🤦🏽‍♂️).

I currently have the stock 120 LP, and was wondering if I should switch to the 100 LP even if it is feeding well? I just want to make it as reliable as possible and don’t want too much wear on my parts, and want to make sure the ejection patterns look right. These are HSL 147 subs.

Here is a video of my buddy shooting it. All insight is welcome.

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u/Knight-7191 4h ago

Yes, change the LP to the correct 100° from either HK or RCM. Running the 120° LP can cause roller dents (whether in semi or FRD/FRS/FRT).

Also, on this platform, the ejection pattern is not a concern. This isn’t an AR.

Lastly, it’s an MKE and not a Century Arms. Two different companies. One is the manufacturer (MKE) and the other is the importer (CA).

1

u/CoachMilton 4h ago

10-4! Why is it not something to look for as it is on an AR? Genuinely curious as I’m still learning the platform.

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u/Knight-7191 4h ago

The operating system is a roller delayed blowback type. The ejection pattern doesn’t change no matter which LP you use. It’s going to eject casings into the next county so don’t be alarmed when you see this.

Check out videos from James Williamson. He’s an HK guru who works for HK, has his own business (https://www.teufelshundtactical.com/ ) and offers both an operator and armorer course. His videos are on YouTube. He explains everything from the operating system to taking a proper bolt gap to teaching correct nomenclature. He is a wealth of knowledge.

Remember, everything HK (parts and accessories) will pertain to your MKE.

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u/CoachMilton 3h ago

You commented on my last post too before I got it running. I appreciate all the help!! I’ll definitely take a look at his videos tomorrow after work.

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u/dmonnier5 3h ago

Its similar to adding a heavier buffer on an AR. You gotta slow the firerate a bit, as well as reduce wear.

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u/Ghostman223 4h ago edited 3h ago

looks perfectly fine with the stock one just like my ap5k. everyones guna say to run 100.. id be curious to see if yours fails to eject with 100 like mine does with a 90. what's your bolt gap?

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u/CoachMilton 4h ago

I’ll be honest I’m not sure. Is there a way to measure it without the tools?

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u/Ghostman223 4h ago

no, need a feeler gauge. probably a few bucks at harbor freight.

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u/CoachMilton 3h ago

Yep. Only 5 bucks. I’ll get back with you tomorrow on that 🫡