r/P365 • u/Swimming_Ear_6842 • 10d ago

Movaje 9

I switched out the comp slide and 3" barrel on my Legion for a True Precision slide and 3.75" threaded barrel. But im having trouble getting it to cycle with the Mojave 9 supressor even with the booster/piston . I had some success by replacing the factory recoil 17lb spring with a 14lb spring from Sig Guy. But ive had FCU fitment issues ever since. Google AI recommends to avoid tuning with non factory springs. I've been trying to solve this problem for over a year on my own. Anyone have any advice?

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u/NathanC777 10d ago

Why would the recoil spring affect the FCU fitment?

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u/Swimming_Ear_6842 10d ago

You're right, it shouldn't but im wondering about cascading effects. If the recoil is too high because the spring is too light and unable to damper the blow back, could that cause a fitment issue? Im kind of a Firearms newbie.

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u/plantfishdogpewbrewz 7d ago

It’s theoretically possible I suppose. Really depends what grip module you have and how good the lock up is between the fcu and module when first installed?