Different model of x5 legion?

[Rpope423]

So I picked up a back up legion today and I’ve been told there is a new version of the x5 legion that accepts the SRO and the first model x5 legion doesn’t. 
 

something I noticed between my 2 legions is the barrel where the round is chambered, one is a full square and the other one has a weird slant cut. (neither have the LCI hole) 

 

can someone give me some info here on any differences

[The Donald]

The Legions made after March of this year were also drilled to fit RMR patterned RDS. 

[Rich406]

The barrel change was made around the end of last year. The new barrel has more case support. 
sig is constantly making small undocumented changes to the p320. I can think of 5 or 6 off he top of my head, there are probably many more. 

[Chutist]

I've got a used Unfired one from early in the year and a BRAND NEW one from last week.  Now I have to do a side by side to see if there's a difference!    I saw "extra" holes in the slide in the older one when I put the plate on for the Sig Max.  Insert head shake here that I have to buy an addaptor plate to mount the top of the line Sig Sight on the Top of the Line pistol.... But here we are.

[echotango]

Same. Amazes me who thought of that. I bought 3 plates to mount XL's.