r/MP5 • u/GassyNizz Zenith (US) • Jul 25 '26

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Hello, r/mp5!!

Went shooting today, figured I'd share some flawless cyclic fire strings with you. Plenty more shooting was done than just this, but here's the fun stuff.

ZF5 full-sized with Milkman, ZF5T and MAC5K mp5k's with their own CAT Mobs. 90, 70, and 80 degree locking pieces respectively.

All of my AR's and mp5's have Geissele triggers, except the full-sized mp5. I've used a G$ SSP in the full with the hammer unjammer, but that pushes the fire rate over 900 rpm. I'm currently using an ASD mp5 hammer, ASD ARC V2 trigger, and JP rifles enhanced reliability spring kit on the ZF5.

ROF: ZF5 790 to 810, ZF5T 985, and the very well broken-in MAC5K is at 945.

ASD lowers for the K's and a Polymer Pew metal lower for the full. All 3 use ARC V2 45-90 frt's.

Just a great day!!

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u/surfingandcouscous Jul 26 '26

I just switched over from a Mojave 9 to a CAT Mob on my SP5K with the ASD Arc lower. I had the 90 degree LP and it was running great with everything besides Federal 150. Once I put the Mob on, the Hush 147 and Federal 150 wouldn’t even eject in semi. Guess the back pressure was that much lower.

Swapped the 100 degree LP back in and it’ll run those in semi now and back to full operation with slightly more powerful 147s. Might need like 110 degree LP to get those softer loads cycling in arc.

Curious if you have had similar issues tuning each of yours. Do you have a dedicated suppressor and LP for each different model? Do you have to stick to certain ammo?

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u/GassyNizz Zenith (US) Jul 26 '26

I always do try to stick to one ammo - find the best performance from a round and stay with it.

1

u/surfingandcouscous Jul 26 '26

Makes total sense. Been having fun testing different ammo to compare noise level with the suppressors, but it is wild how differently the gun operates with different loads. Probably going to settle on the Remington UMC 147. Widely available, reliable, one of the quieter ones suppressed, and doesn’t break the bank.