*Snip*
As Slash uses Alnico II pickups and the more modern tones suggest at least AV and possibly ceramic; in many ways the alnico IV of the Abraxas may be the best compromise as it's vintage enough for Slash but hot enough for the modern tones.
I'm rather new to BKPs myself, I don't have a warm sounding Mahogany Guitar, but I do have a Basswood one with the Abraxas in bridge. And I gotta agree with what Slartibartfarst42 says here about the Abraxas. I'm a huge Slash fan, and play everything from early Guns 'n Roses to his (imo better) latest solo project. And the Abraxas catches the sound dead on with abit of on guitar/amplifier dial turning. My thus far favorite riff to play on my Abraxas is the Nightrain intro riff, it's straight out of the record.
In my opinion the Abraxas handles gain well, but not too much, I usually keep mine at 4 or 5 and it gets a very good string distinction and very good singing tone, which is great for Slash stuff.
I was asking pretty much the same question as you are asking back when I wanted to get my first BKP set. Altough, with abit more Bluesy sound to it.
Altough, I classified Slash more as Hard Rock. And Lynyrd Skynyrd as an example for Classic Rock. Might just be me, again I also consider The Beatles to be Classic Rock.
I really can't tell you how it plays for stuff like Black Stone Cherry or Alter Bridge, as I don't play much of that stuff.
However, judging from what I've heard of those bands, I think the Abraxas will do ok. Something abit hotter will be best for that stuff. But it all comes down to what you play the most. The Abraxas will hit the Slash tone dead on, anything hotter will still sound good, but I doubt it'll be as great as the Abraxas to get the awesome Slash sound.
Altough, I can say I find it extremely, and I can't put enough emphasis on that, good for for solos, it's clear and the string distinction is superb on mid gain. It chokes abit of you crank the gain though.
Now that that's said. Here's some random inexperienced rambling.
I too might be getting myself a Les Paul Classic soon, that or the new standard (Got a thread about it on the Guitars, Amps & Effects forum, to try and get some opinions on the guitars before I try and buy, occasional faults, neck feel, build quality feel and that kinda stuff)
And I've done quite abit of research to find a pickup to go well with that which I want abit hotter than what my current Abraxas can provide. And considering we both have similar music taste.
I've quite set my eye on the Nailbomb, which sounds great imo. Mr. Air posted a soundclip to show it's versatility here:
https://bareknucklepickups.co.uk/forum/index.php?topic=27953.0That clip alone pretty much sold me. Search around abit for some soundclips, most of the clips are very metal oriented though. At 4:20 (coincidence, I think not) You'll find the Nightrain riff, I think it sounds great. With the gain dialed down just another notch, I think the Nailbomb will do a decent imitation of the slash tone, but with a tad more crunch to it
As for your Neck Pickup. Well, my only BKP neck is a Singlecoil, that won't help ya much. But the Abraxas does good things clean in the bridge position atleast, albeit abit bright and twangy for my taste atleast on my basswood, but in the neck I see no reason why it wouldn't shine.