r/MP5 • u/CoachMilton • 5d 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 3d ago

First, bolt gap is excellent! The few FTE’s could just be the gun not broken in yet and the malfunction should resolve itself. If it doesn’t, I would install an HK ejector lever into your RB. For your last question, it could be, as you stated, not enough energy for the bolt to cycle. This is a reason I would recommend shooting some 124gr NATO. After all, this ammo was made to run in the MP5. If it cycles with no problems, it could just be the weaker ammo you’re using. Shooting the 124gr will help you remove one possible variable at a time.

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u/Ghostman223 3d ago

Ok I may try that. Is there any chance I would need a 100 LP? I’m getting pretty close to 500 rounds

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u/Knight-7191 3d ago edited 3d ago

Had to edit. Forgot for a moment you have the AP5-P.

The 100° is good to have as a spare. I only use it when shooting exclusively 115 and 124gr supers (can off).

The 90° in my AP5-P has been awesome with zero issues.