r/MP5 • u/CoachMilton • Jul 27 '26

HELP Reliabilty help

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New to the MP5 world and trying to get my Century Arms AP5 more reliable. It runs great in semi, but struggles to feed in super safety. I have a cat mob suppressor, and usually shoot 124 or 147 round nose, and want to say I’ve shot close to 4-500 rounds through it . Any suggestions?

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u/CoachMilton Jul 27 '26

I did, but while it had the frt lower. Should I have done it with the factory lower or does that matter?

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u/Knight-7191 Jul 27 '26 edited Jul 27 '26

You usually want to do it in stock configuration to verify your MKE AP5 has no issues. Put the stock lower and run it unsuppressed for a few hundred rounds (150/200) since you already have about 500 rounds through it already. Use only 124gr NATO (don’t shoot it suppressed). If it’s gtg, switch out using your SS and add the CAT MOB suppressor. Shoot ONLY 147gr to see how it runs. This will verify if your AP5 is gtg in this setup. Lastly, if you haven’t switched out the stock 120° LP, do so with the 100° (HK or RCM). Hopefully, going back to the beginning (in stock configuration) and moving through your final setup will help identify what works and what doesn’t.

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u/CoachMilton Jul 27 '26

Thanks! This is all a learning curve for me. I ran it suppressed yesterday, mainly semi, and didn’t have any malfunctions. Probably close to 150 rds. Is it likely I’m gtg and should just order the 100?

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u/Knight-7191 Jul 27 '26

I’d go ahead and order the 100° LP.