Sig Sauer Complete Fire Control Unit for 9mm/357 SIG/40 SW P320 Pistols – 8900160

I'm sure glad Sig starting offering the FCU as a separate part number. I had a P320SC. Long ago Sig offered exchange kits, so I bought a compact kit (frame, slide, mag). I would switch back and forth between the various combinations. Then I bought a Wilson Combat Carry frame. Well, this FCU let me put together a nice WC Carry pistol. The compact frame is now redundant, and will get sold.

A nice modification for my M18 P320. Makes a fine Sig Sauer an even finer piece if that's even possible.

I used the P320 FCU to build out a pistol using the Flux Raider brace. The flat trigger shoots smoothly and breaks cleanly. The trigger reset is short and tactile. I ran almost 200 rounds through the platform with zero issues. I'm looking forward to getting back to the range again soon. Thanks Sig Sauer.

Ordered this FCU, seemed like a quality product until I installed it and had a dead trigger. Installed it in several of my other 320s and same thing. Contacted SIG who had me send it in. Apparently all of my slides, even the one recently purchased was an older pre-updated model. Sig milled my slide and sent it all back at no charge. Quality product and customer service. Buy with confidence!

when you complete take down and assembly ,with slide locked back, pop a empty magazine in the magazine funnel press button to feed and then drop magazine once fully seated .release the slide and you never had a dead trigger. the magazine activates an pawl-rod-lever, and activates fcu to operate as designed. try this before you flip out thinking you got a bad fcu. i have never recived an broke or damaged an fcu

i have found upon disassembly and re assembly to swap grip module. as assembly begins with trigger and same or different slide lock it back insert empty magazine while pressing magazine release button. the magazine will contact a internal lever and let in freely drop out of grip module. now slide can be released and trigger will operate as designed. if magazine not installed and removed when you cycle the slide you will find you THINK you have a dead trigger. so yes firearm can be assembled and

i own 4 p320 fire control units. flat trigger ensures no missed shots from trigger pull. trigger reset is short, positive, crisp, silky smooth, trigger break and slight take up is consistently repeatable. no grit in pull or release fcu assembly stays assembled when removed from grip module. excellent trigger reset. if you feel the need to modify or say upgrade the trigger fcu it is entirely not needed. however there is that individual that will swear fcu upgrades helped..... this stock fcu is

No complaints- solid gun. Very reliable, trigger release is consistently the same every pull. Easy to maintain and clean. Simple take down. Very accurate. More so than I am capable of being.

Fits like a glove. Completed my X5 build yesterday, and just like you'd expect from SIG, quality, fit and finish is perfect! 5 stars!

Pulled the trigger on the new upgraded FCU, glad I did. Clear difference on the trigger pull and it looks and functions fantastic. I also added the Apex Forward set trigger bar and its even better!

Its a Sig Sauer FCU its great comes out of the custom shop ready to run will be using it in a build up of a new Pistol soon just trying to decide what I want it to be.

I have been trying to get this for 2 year and now I finally have it. All I needed was this FCU to complete a new build from extra parts I had laying around. I now can switch to different formats of the P320.

The first time going into the frame it was very tight, and the pin was hard to manipulate. However after use it loosened up. The trigger is a little mushy but still smoother than the polymer x-trigger.

It is great to be able to purchase this separately. However $350 price seems high , when you can get a complete P 320 for about $500. Sig is famous for parts costing almost as much as a complete firearm. Having said that, if you have some extra grip frames and don’t want to pull your FCU from another pistol, this is worth having. I have not noticed any significant improvement in the trigger or function of this FCU over the one on my M17. Perhaps it is just custom shop hype

Thank you Palmetto State Armory for offering the Sig Sauer P320 FCU in 9mm/357 Sig/ 40 SW. This allowed me to build my own P320 X-series compact 320. Appreciate the competitive pricing, availability and free shipping.

Not impressed,, it feels like a standard fcu with a flat trigger and what looks like gold cheap spray paint finish. PSA outstanding on the buying and shipping process.

Nice Trigger! I purchased a P320 in 9x19 some time ago. I found a caliber change kit in 357sig shortly thereafter. I never fired it as a 9mm. I had the slide assembly and grip in the box doing nothing. I saw these on sale and thought "all I need is a FCU and I have another pistol" It was like Christmas! I like this trigger over the stock one.

I finally was able to find the FCU in stock and ready to be delivered at one of my most trusted firearms websites, Palmetto State Armory. Their shipping was quick to my FFL. Now I need to research what aftermarket, and Sig have for options on their websites, because this part is so configurable. I am considering a shorter version of the P320 with a slide mounted red dot or a holographic display. I know Holosun makes both. Thanks to PSA for their great business model and super ethics.

is a return item ,the box was opened when i received item and there is someone fingerprint on the sticker

I enjoyed building my own p320. There’s plenty of after market and endless possibilities when it comes to configuration. One thing to note is, your not going to save any money over buying a complete gun so if that’s your goal I would look elsewhere.