Whenever possible folks please include descriptions, part numbers, and how to's when you post pics. Pics are the primary reason for this thread, but it helps cut down on a page of discussion on "what is that", "how did you do that", and "where did you get that". That will then become a discussion on calibers, magazines, etc, etc. I thought it might be a good idea to sticky a picture post in this section, with the various scope/sight mods, and any other adaptations users have done to their Subs. This way new or prospective Sub owners would have a quick look at what can be done with this wunnerful little weapon. Atlasx, here's a place to show your scope mount, Mod_man your pigsticker, rjhauser's Hubble telescope, and others to name a few. Bring out the pics!
Since there has been so much interest lately in what can be done to the Sub 2000, and I have answered questions from 3 different threads on what I did to mine, I thought I might show the evolution of each step I took. I'll try to remember to list parts for each Mk. Prices listed will be estimates of what I spent without shipping.
Green is good money
Yellow is iffy (Most are no longer in use)
Red is what I consider too expensive or a bad purchase, even if I'm still using it (Like the Trijicon)
MkI KT rail
($20) KT sling
($15) Panther tactical flashlight and switch
($30) Picatinny mount bipod from CDNN
($20) TDI short vertical grip
($20) M4 butt pad zip tied to stock
($10) Cool basic Sub with some useful add ons

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MkII UTG 5 slot tri-rail x 2 (creates quad rail)
($25 x 2) UTG 2 slot tri-rail (front sight mount base)
($15) Yankee Hill Machine 1/2" scope riser (9490)
($15) Yankee Hill Machine 7" rail extension (now 6" 9473)
($37) Yankee Hill Machine folding front (9627) and rear (9680) sights
($90 each) BSA Multi dot reflex sight
($60) Note the lack of forearm. I did this to get the 7" rail nearer to the rear sight area. Fired with it in this configuration ONE time. Burned hand when I carelessly grabbed the barrel to set it down after rapid firing a 15 rd magazine. That and the fact that the tri-rail - while holding zero - shifted back on the barrel during recoil from multiple shots. I also found out during this time that the barrel nut is held in place by pressure from the forearm, so there needs to be a forearm in place!

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MkIII KT short forearm
($25) ATN Compact digital reflex sight
($130) A.R.M.S #36™ S-Ex AR-10 OSR Swan® Sleeve
($99) This was the look I was going for. The ATN sight even looks scale to the Sub to me, and co-witnessed nicely with the AR sights. The KT forearm holds the tri-rail well against recoil, and removed the idiotic need to grab that area of the barrel. I removed the BSA NOT because it didn't work well, but because it sat so tall on the rail I was afraid to carry the weapon slung this way without damaging the sight. The Sub stayed in this configuration for most of last summer

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MkIV Trijicon RX-01 reflex sight
($400) KT mag holder
($11) Surefire G2 light
($38) The Trijicon fell into my lap late August 06. I had some disposable O/T at the time, and it was purpose built for this specific AR rail/sight combo, so I had to have it! It didn't hurt that it doesn't need batteries (the ATN was dead on my first range trip with it, because I'd accidentally left it on at the house). I hadn't planned on a KT mag holder, but again one came up for about half normal cost, so I got it. The Surefire was an easy choice due to company reputation, a reasonable price ($39), and it fit in a 1" scope mount which I had plenty of laying around. It's easily activated with the forefinger of my front hand, without releasing the grip. Momentary on with knuckle, or use finger to roll the rear cap 90 to the right and it's always on.

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MkIVa Blackhawk double stack mag holder (410600 double stack), ($16 x 2)
I can now hang 60 rounds worth of regular magazines off or in various parts of it. The balance and weight are still surprisingly manageable. And it still slings okay.

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With a Simmons 2X scope for a little more precise shooting. The Trijicon resides on it the rest of the time. I've also added L4E's Tacticool stock tube cover, and bolt charging handle. Nice products.

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Please don't think I'm being pretentious. It's just been a fun project over the past year, and I kind of enjoyed it