Euro,
My MT3 is not off the shelf. It is maximum rigged to the teeth. It wil shoot easy 7 meters tip to fish. It will penetrate 30kg medium soft flesh fish like Dog Tooth Tuna at this distance and enough penetration on the other side to toggle the Ice Pick.
I am using 6 x 14mm bands and 3/8" shaft, Ice Pick slip tip, teak front wing kit and teak rear wing kit, aluminum muzzle, 500 lbs cable 4 double wraps ( +-9 meters ) and a reel.
If you use 400 lbs mono, it will shoot even further. 3/8" shaft is a must for inertia keeping at long range. Riffe catalog mentioned 6.10 meter with 5/16" shaft and 3 x 14mm bands. I am on the caution side as my 500 lbs cable is thick and full of drag and 30kg is a lot of meat to punch thru. I can shoot even at 9 meters with this MT3 if the fish is small, say 5kg or less. If you are shooting downwards, there will be extra range. Just remember 1 thing important when you rigged your MT like mine. MT2 and MT3 with 6 bands will require 4 double wraps of shooting line. Twice longer than what the factory gives you.
The best is, at 6 x 14 bands, my MT3 is a 1 hand shooting gun. At 5 bands, it's recoil is only like a high power Euro.The gun is so heavy, the recoil is very decent. You can use the new PU black front wing, cheaper and works well too. Among my friends this 127cm overall length gun is very well loved...we have 7 units. 2 with black PU wing kit.
The MT4 is one meter more deadly when fully rigged but it is longer at 142cm and heavier still, a friend of mine has one.
I have a fully rigged MT5 but I seldom use it, too long at 157cm. I reserve this for 30+ meter water visibility. I just love short cannons. This is my second MT3, I lost my first one, had to surrender it to a big Doggie.
I can shoot Rainbow Runners ( small slim fish ) with 6 bands while tracking the fish with my MT3, it is that fun and easy to manuver. The downside is cost. The two wing kit alone is +- US$165 installed for front black PU and rear wing of teak.
My friend just bought MT2 rigged similiar to my custom MT3 but with black front PU wing kit. It is so small and cute at 112cm overall. This should do well for you at 6 meters tip to fish for 30kg and 7 meters for sub 10 kg jacks type of flesh. This guy can shoot even shy fish like Green Job fish with his MT0 (86 cm LOA ) with 5 bands shooting 36" x 3/8" shaft. Original shaft should be 32" long.
I am a scuba spearo not a freediver, thus long range shooting is a must. I target pelagics and they don't like being close to me.
Forget shaft that does not have sharkfin, those wishbone recess only weakens a shaft. What cut off a good shaft for less strength ?? It also means you will have to use a slide ring on such shaft....noise and longevity is a problem.
Good luck shopping....