Getting hold of a real one will make a huge difference.
The airsoft versions feel nothing like as solid as a real one.
That said, I'm still not a fan for most builds, just a little bit bulky for me.
I ordered something from their sale late weds night, it's arrived this morning.
I used to think of them as expensive and having poor delivery times, they just beat every other reputable uk retailer by a good 24 hrs in my experience.
I use a safariland SLS holster for 226 with taclight on a duty ride belt platform.
They're very expensive but occasionally come up on ebay etc second hand. Last for years though so a good investment. I've always found "airsoft" holsters to lack in durability and feel a little less secure.
There's one here on Ebay currently.
https://www.ebay.co.uk/itm/156628492034?_skw=sig+p226+safariland&itmmeta=01JHX50T132VTSCC0SYDXPATYJ&hash=item2477c91f02:g:Z2YAAOSwTFVm0Oas&itmprp=enc%3AAQAJAAAA0HoV3kP08IDx%2BKZ9MfhVJKnIU9S5WYqNsJL%2B2pg%2FcsQPjl9QiNg5c%2Fp3dw%2F7ab7%2BPsg4qFhUeujs%2BTIvlUH%2Ft8s4F1bVy86AFH84ZH2IDVHjWLWk4QFDHAD7OE5V9EfDJ8Em1pspaHPum4IIXqSq%2BRkwRm%2ByXfSb6IIlH0ocLJ%2BiVWDHFe0OVj%2BS8%2FTlHJpNsMCdK2ctxORxTSSdxSglDEkyDCBhKE8T4x9jsafHqJM4OL5IQZjtBJcyBd%2Bn4SSrPVTrvZZyD0l48Sz4iAy4FWc%3D|tkp%3ABk9SR9Kgg6WPZQ
Above option is the best if you can order the part.
Also achievable by filing 08-20
I would caution though that parts like these are not designed to function with material removed, and I doubt that they have been case hardened or similar as they would be in a real one. So a real risk of breaking.
But defo buy the part if available as this will retain value if you decide to ship on at some point.
If you are looking for a permanent mod then it should just be as simple as filing down a sear.
Not seen inside one but they usually work on a very similar principle to real ones in that regard.
Take off the lower and snap some photos and we might be able to tell.