Sorry for my delay Alen.
I don't prefer warm white (I like NW, CW would be ok in some cases, warmwhite is a no go for me), so I couldn't help to find the best warmwhite tint deal.
I haven't seen a complete genuine L2 in silver for a long time (last time 1-2 years ago) - I mean for a good price. I think the price was round about $11-13.
You can get one in the USA for $25 (shipping to Europe is expensive - round about $15: $40 is to much for a L2. For $40 I can get better flashlights). Kaidomain sell a genuine looking L2 with a Cree ER-E R2 for $34,93. This is not a good price, but if you want a genuine so bad an option.
Often the silver are called grey or gunmetal grey or something like this. For $25 I would buy a blue L2p (I love blue and this is the reason, why I have one). The L2p is also avialable in gold, black and grey (real grey - not silver).
Many HongKong shops offer silver "L2" or "L2m), which are not genuine. The
genuine L2 and L2m could not tailstand - if you find one which can, I would say 99% copy chance, 1% genuine if you get it from a collector - I think there was a tailstandable switch, which could be bought separate. If you find a HongKong shop, which offers a tailstandable L2 out off the box I would say: 100% clone.
The copy L2/L2m aren't bad (I got a L2 copy one year ago, because I couldn't get another genuine L2). The quality isn't as good as a genuine, but a good solution. The head of Solarforce flashlight fits, but the tailcap not 100% similar as the 504. The built quality is a bit better as my 504.
I write this and now a new idea come up in my mind: A black one and remove the HA surface (for example with drain pipe cleaner - do this outside, never in a room beacuse of the acrid fumes). I haven't done this until now, but a few others with Ultrafire and some with a Solarforce. The HA of Solarforce is better as Ultrafire or other cheap companies and it take longer to remove it.
Is the surface of a removed HA flashlight better as a copy L2 in silver? I don't know.
If you want to play Solarforce Lego (combine other heads, switches) you have to buy a genuine. If not a copy Solarforce L2 could be ok and have the advantage of tailstandable and reverse clicky - price round about $10-11 (I have a not tailstandable forward ckicky, which switched on in my backpack. After 1-2 hours I need something out of the pack and saw the light). Now I take only reverse clicky tailstandable flashlights in my backpack.
A forwardclicky is in a holster on my belt.
Link to a 504 body: Take a look at GJ post $7,68 (shop lightake). link to genuine Solarforce black (Solarforce-sales) to remove the HA incl shipping $14, copy L2 in silver (shop focalprice) for $9,79 (with the coupon code RMN7 only $9,10 - expire 31. May).