how much of difference do you feel from regular railguns and are you happy with it !?
I have the omer 105 roller.
I have shot the gun quite a bit and the biggest surprise for many who have picked it up, are the 14mm bands. I have a 14 on my SK40 and that's snappy enough with a 6.3mm shaft but the roller, well...
OK, model specifics aside as I have had issues with the omer, specifically a leaking muzzle which is in the queue for being fixed this winter but, overall, the roller model has some real plus points.
If you load the 105 roller to full power, it will fire the shaft bolt straight to 2 full wraps and bang the bungy. Once you get by the learning to load a roller efficiently, it's really no problem, especially if you make yourself a wishbone loading cord.
I know many have made technical comparisons between fixed length and roller guns in a barrel / barrel length test and I have shot 130's with 2 X 16mm bands that don't have the real snap, speed and punch of this 105 roller at 2 wraps.
This is why I suggested 2 tabs rear. One mid barrel rear, and one near the rear of the barrel. Sometimes I'll carry this gun and be faced with mullet or softer fish and lower vis than expected, perhaps I'm shooting in and around reef so I'll lower the power and the roller still outperforms a fixed muzzle/band arrangement.
I am in 2 minds about trying Rob Allen 14mm on the gun for next season but recent years have seen me get sidetracked away from guns much of the time to polespears. This said, I still have enough experience to know the design is sound.
However::
I'm very much a guy who likes stuff to work and keep working and finds spending money on a gun, or whatever a bind if 6 weeks later, or a year later, items break down or don't maintain this performance.
I can say, hand on heart, across 2 guns, the omer performer 14mm rubber is 'outstanding' so, consider it for any roller build. You need a band you can load, but, still snaps back FAST and true after long soak/loaded times.
OK, yes, the muzzles ARE heavier but I find this useful.
It's weird really as I own many guns. Some are easy to track, others you don't even notice. Many times you just use a gun and you take no particular notice of muzzle weight and swing etc. As mentioned, my SK40 actually floats with a spear on and yet at depth, behaves perfectly, even in swell. Other guns I own are yo-yo'ing around like a kid on a trampoline.
Things like this are important to note when making comparisons in guns as the roller, pretty much HAS to be nose heavy and the longer you go, the heavier that weight feels. It improves the shot that's for sure, especially at full power.
I can shoot some longer 120, 130 guns and have to aim slightly high to allow for the up tipping of the shaft as the recoil takes effect on the shaft. Not so much with enclosed tracks and especially enclosed track rollers, which we are talking about here.
So, in effect, I would say, with a 150cm shaft, the 105 roller is easily the power equivalent of a 130, maybe a 140 and really hits hard yet, it has the recoil of it's own length and not a longer gun. The 14mm bands are EASY to load and the accuracy is brilliant. They are heavier but, swing truer, albeit slower but, you'll not likely be using a long gun for rooting around stuff anyway and it'll be purposeful waiting.