I was going to get round to making a thread about this at some point as i had the same question a while back.
There is some real tat about so know what brand etc you are after before ordering.
I've found AliExpress the cheapest if you don't mind waiting a while. (some can be within a week...
If your looking at 6mm replicas now (from your Glock thread) youll have access to much better replicas than the Krown Land 4.5mm
This one didnt stay very long in my collection once the 6mm options opened up.
I like the Sigs. Never had a problem with the M17 / M18. I don't own the X carry any more but internally its identical to the M18 (just the different lower frame)
There are plenty of other nice modern replicas available.
My pick right now would be the Staccato P or the more compact C2...
Oh i wish they did. It would be top of my list.
Umarex do / did do the M&P9 2.0 in a 4.5mm version but its a half blowback affair. Never seen an airsoft version.
https://www.cheshiregunroom.com/umarex-smith-wesson-mp9-m2-0-co2-air-pistol
Still one of my favorites is the version one.
Umarex...
All depends what style of 1911 you like the look of. Older non railed. More modern railed. There is a railed Colt for sale in the classifieds at the mo.
Swiss arms, Remington, Colt all have some nice ones.
There are some 1911s for sale which are not the same KWC OEM build. They have a trigger...
I had a look at one in a shop a while back. From what I could tell it's the same as the standard kwc OEM 1911's which are pretty nice. It has a slightly different molding and some extended length grips. It's pretty pricey compared to the others, but is one of the better looking ones in my opinion.
If it's just for fun I would remove the pellet requirement. That opens up a much wider selection of better (in my opinion) replicas.
ASG CZ Shadow 2 maybe, or the older Shadow SP01. Both are great.