Thank you. That is most helpful.

I wonder if the new custom works FCU is like that also.

 

My brother in law has the x5 It came with the 4 magazines which is a huge plus in my eyes. I just purchased the x5 X-change kit. It came with the Tungsten grip and has both recoil springs but only two magazines. I have a regular FCU from my subcompact 320. Honestly for the price of the xChange kit from sig it was worth it. I think it feels better than my brother in laws X5.

 

I just got a new x-5 x-change kit and I'm trying to figure out what size screw to use on the smaller outer most holes for RMR/holosun. Any ideas? its not 6-40

EDIT!! The 6-40 did work. There was just some tension after starting the threads so I didn’t want to damage them so I stopped and figured it was the wrong screw

 

Excellent write up. I didn't realize that the Legion FCU had changes making a sear swap more difficult.

Is that something that is easy to explain? I've taken my FCU down to the individual components often enough to be familiar with the process.

 

It just that the angles on the FCU are slightly different in how the FCU is bent in front of the trigger opening. The "old style" I'm really guessing on order of production here. Just that my legion was very fresh off the assembly line when I purchased it. Picked it up mid January 2020 and it was built mid December 2019. FCU was picked up about 5 weeks later. Anyway, the bit I point out below makes getting the take down lever safety back in a much bigger pain in the butt. Out one is a needs both hands job, the other is needs both hands and some effort. Back in the old one is a need two hands and a tool job, and the other is two hands, a tool, and really wished for a third hand kind of job. It's doable with the right tools, some patience, and the right expletives.

Rando gunbroker FCU that appears to be olde. Nore the bit the arrow is pointing at is nice and square. -

12-2019 Legion FCU Note that same bit is not as square. It is more obvious totally disassembled, but that tab ahs all been folded up slightly. -

 

-The legion is gray. The x-5 is black.
-Your legion may come with a LCI indicator notch cut, which sucks for running an optic (it also may not, mine didn't) The X-5 will not.
-The legion has different trigger geometry and a lighter factory pull than the x-5.
-The x-5 came with a pretensioned barrel setup. None of the legion/x-5 type slides seem to have this anymore.
-The x-5 came with 4 21 round mags, the legion comes with 3 17 round mags (unless it's a 10 round sku).
-The legion has the legion engraving on the rear sight insert, the x-5 does not.
-The legion has a steel guide rod that takes 1911 springs. The x-5 came with a captured recoil spring setup similar to the normal p320 pistols.
-The legion is newer, and thus will have the current set of minor revisions to internal things. For example, I have an older FCU and the one in my legion. There is a difference in the shape of the FCU in front of the trigger that makes disassembly of the whole thing harder on it than on the older FCU. The older FCU is really as easy as it looks in the youtube videos. The legion comes from the factory with 72% more cursing to get the whole thing apart for a sear swap.

Is it better? Well the trigger is, but getting a grays guns or armory craft trigger will get you the modern geometry on an old x-5. Other than that it is your preference as to heavy or light. The old recoil spring setup with the grip weight pulled out on an x-5 grip module is as light as you can get the x-5 platform. The TXG grip plus a tungsten guide rod, plus a tungsten grip slug is as heavy as you can get it (well unless you want to to an epoxy and silicon carbide grip job, then you can use tungsten powder fill in the epoxy).

 

-The legion is gray. The x-5 is black.
-Your legion may come with a LCI indicator notch cut, which sucks for running an optic (it also may not, mine didn't) The X-5 will not.
-The legion has different trigger geometry and a lighter factory pull than the x-5.
-The x-5 came with a pretensioned barrel setup. None of the legion/x-5 type slides seem to have this anymore.
-The x-5 came with 4 21 round mags, the legion comes with 3 17 round mags (unless it's a 10 round sku).
-The legion has the legion engraving on the rear sight insert, the x-5 does not.
-The legion has a steel guide rod that takes 1911 springs. The x-5 came with a captured recoil spring setup similar to the normal p320 pistols.
-The legion is newer, and thus will have the current set of minor revisions to internal things. For example, I have an older FCU and the one in my legion. There is a difference in the shape of the FCU in front of the trigger that makes disassembly of the whole thing harder on it than on the older FCU. The older FCU is really as easy as it looks in the youtube videos. The legion comes from the factory with 72% more cursing to get the whole thing apart for a sear swap.

Is it better? Well the trigger is, but getting a grays guns or armory craft trigger will get you the modern geometry on an old x-5. Other than that it is your preference as to heavy or light. The old recoil spring setup with the grip weight pulled out on an x-5 grip module is as light as you can get the x-5 platform. The TXG grip plus a tungsten guide rod, plus a tungsten grip slug is as heavy as you can get it (well unless you want to to an epoxy and silicon carbide grip job, then you can use tungsten powder fill in the epoxy).

You left out the price differential between the two.

 

Most significant is the TXG Tungsten infused grip module. I shoot USPSA Carry Optics and I bought the X5 Legion because of the heavier grip. The perceived recoil is less in my opinion and for me me it shoots flatter and I'm able to get the dot back on target faster. Everything else between the two is similar except the trigger on the Legion might be a little better. The first X5s came with four (4) 21 round mags which is what I prefer instead of the X5 Legion's three (3) 17 round mags. The heavier TXG grip module is available now as an accessory so if someone already has an X5 and they are happy with it, I say just buy the TXG grip module and see how you like it.

 

I agree. Most will have already upgraded the trigger so the only significant remaining difference is the TXG grip module.
I was originally looking to get the Legion when it came out but as time went by and reading reviews, etc., I just got the TXG for my original X5.
I no longer have any desire to get an X5 Legion until one of my X5's poops out.
And the only reason I'd do it then is because the original is no longer available.

 

SIG Sauer X-Five vs X-Five Legion - What's Different?

With the release of the new X-Five Legion, many people have been asking what SIG did to change the X-Five Legion from the original version. There has been a number of improvements to make the gun shoot flatter and feel more balanced in the shooter's hand. Among the changes were to the grip...

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