I took the tar-21 rifle by dutchwarlord, already a decent design, and chose to modify it. I know it bears little to no resemblance but the core body and mech is very similar. Anyway here are the new specs:
range: 70-75 feet with good bands, proper placement,and green rod/grey connector ammo (maximum)
accuracy: really not that good... I can hit a 2 inch square from 20 feet with the iron sites (scope is basically just for looks)
power: enough to really sting if you let your hand slip in front of the barrel
looks: quite epic if I do say so myself :p...not at all a replica now though
strength: not as sturdy as I'd love but it can stay pretty much together if you drop it from 4 feet onto a hardwood floor
ease of modification: surprisingly really good!
war type specialization: indoor wars are great with this gun, outdoor not so much because of the epic fail that is accuracy on this thing
ergonomics: handle can dig into your hand a bit, and the mag release isn't quite as easy to access, as well as there being a danger of getting your cheek bruised if you put it up against the bolt handle, but it's nice and heavy and has good balance. It feels pretty good in the hand overall.
ease of use: this gun has all the features you can really ask for at this point, and they actually work pretty well, but sometimes things can be hard to reach or find in the dark
reliability: this gun is really reliable. if you fire single shots loaded by slotting a round in the top you won't get a misfire if it's done right, and except for after a fall I haven't had anything jam or break. A really pretty reliable gun, even if it sometimes can get a bit jammed if you use multiple rounds in a magazine with a rubber band (a side effect of the quick load port, you can put a small grey connector with a green rod in there and completely fix it, but then single fire is almost out of the question)
stock: fairly well attached if built right, very sturdy and quite comfortable. Internally houses the ram, nothing external except the charging handles
main handle: sturdy, nice angle, safety can sometimes dig into the back of your hand but not too bad
forward handle: basically just a guard on the first one, an awesome vertical grip on the second revision. Quite comfortable and very sturdy.
forward grip: fairly comfortable, doesn't dug into your hand at all but isn't all curvy and such. Utilitarian in design.
safety: very reliable and solid, but can dig into your hand a bit sometimes
top iron sights: quite accurate, visually pretty nice, nothing extraordinarily awesome or special
mag release: quite reliable, one of those things it's a wonder it even works, but works really well. Quite secure
mag well: sturdy, looks OK, not that easy to just slip the mags in blind though
Now let's get started with the retrofit instructions! :p
(as in PS I'm really sorry they're a pain in the *** to follow. maybe I can improve them at some point if people really like the gun)
Please note, at this time the instructions are only for version one while the refined version two is shown in the first few pictures. the core gun is the same, it just has a different handle, a couple parts cleaned up, a cooler looking (IMO) scope, and a stronger stock, magazine, and cleaned up top rail.
Step 1: Main Body/Core
Build the dutchwarlord version and then take off the stock, front barrel, magazine, and such and modify it to look exactly like this. pretty much everything is possible to modify just from external pictures. If you don't have any clue for any part leave a comment and I'll try and help add best I can :)
Step 2: Stock, Slide
Pretty much the same idea as the first step... look it over and make the mods. Note that the upper slide needs to be parted like that to allow the bolt to move freely within it!
Step 3: Rear/Top Bolt Guide
Not that hard, make sure you don't slim it down and put the yellow ones on diagonal clips as that would make the bolt get caught and break
Step 4: Bolt/Slide/Pin
Use electrical tape!
Step 5: Front Barrel
Make what you see in the first picture, the ones after that are just different views for reference, not different parts
Step 6: Front Grip
Basically identical to the one on dutchwarlord's TAR-21
Step 7: Front Iron Sight
So...yeah... build this
Step 8: Magazine 1 (original, Multi Round Mag)
Fairly similar to the original, internally
Step 9: Single/Double Shot Sniper Mag
Not high capacity, but very reliable and helps keep the round very secure and flat in the chamber. Also, it can look way cooler depending on how the rifle is set up :p
Step 10: Scope
Quite useless, but looks fantastic. Use the iron sights if you want accuracy.
Step 11: Ammo (indoor)
build this (x30 or so)
Step 12: Ammo (outdoor)
Build this (x infinity)
Step 13: Main Build (core to Stock)
THIS IS THE HARDEST PART, make sure that on the top the guide is not clipped on one side
Step 14: Main Build (front Barrel and Iron Sights)
Step 15: Main Build (bolt and Rear/top Guide
Step 16: Main Build (front Grip)
Step 17: Magazine Insertion
Step 18: Bands!
This step varies depending on the bands you have