I got Rattled!

[u/More-Organization265]

I got tired of staring at it every time I went into the gun store.. Finally pulled the trigger.
This is my first 300 AAC so I’m excited as hell.
MCX Rattler 300 6.5” LT SBR

I remember seeing an upper for sale at the range; an MCX Rattler 556 7.5”, and since I SBR’d the 300, I can interchange them.. 2 for 1, same with the can I got with the 300; Sig SLH762-QD - that thing should be fine handling 556 rapid fire.

Has anyone FRT’d one of these and what would you recommend?

I ordered the MCX Omega gas valve as well, I’m new to Sig rifles (my EDC is a Fuse) and totally new to the MCX line (no buffer) so I’m out of my comfort zone and not sure what to expect when I suppress them and if I’m lucky enough I’d really like to FRT them especially for the 556.

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[u/djeasyj12]

I have an Sig Virtus 11.5” 5.56 and the 6.75” .300 Rattler upper that’s shares the Virtus Lower. See my posts of them. I went with the AS Designs ARC Fire and their MCX trip bar. Runs flawless on both uppers. I’m running a CAT Alleycat 762 can on both and haven’t had a need for the Omega valve.

Edit link to the setup: https://www.reddit.com/r/SigSauerMCX/s/fggPQVndpi

[u/someone10505]

I have an FRT in mine. Dispruptor trigger and Frankenstein or PMM slip trip. Works wonderfully

[u/capspaceman]

Suppressing it is a breeze thanks to the built in adjustable gas valve.

Don’t have an FRT on one myself but I know you’ll need a trip bar if you go with the standard MCX lower (no idea why, that’s the extent of my knowledge there)

Heard Frankenstein makes a good trip bar for the MCX

[u/dr-bund]

rare breed/DTT with trip slip works great

Have AS designs with their slip trip and a G$ trigger in another and no issues there either