I've fired mine with the original barrel and the groupings were within an inch at 40m so I was happy with that. I figure putting an HK flash supressor on the original barrel would be cheaper than getting a G36E barrel. I'm not really concerned about having a bayonet lug. And as for the sight/carry handle, would you consider it worth getting or are there better alternatives out there?
I'm torn on the 3X sight. It has the most narrow field of view I have ever seen on any optic. Even with my nose up close, it's a very small aperture and not the easiest to pick up, especially with any speed.
However I really like the small donut with fine cross hair reticule that is inside. Somewhat similar to an Eotech.
There are also ranging lines in the bottom left image of the sight, but I haven't used them. And to be honest may never use them enough to really care.
The glass is very good.
It was easy to centre. It has a continuous smooth screw that you have to utilize an allen wrench for adjustment. Therefore, you are not able to do "clicks" for various distances while maintaining a centre hold. I'm use to using the "open gate" method of clicks with my C79 Elcans on my ARs/M16/'C8' for pre set distance adjustments. And to be honest, I really like that feature.
So there you go. It looks kind of funky LCF 8/10, (always important), has good glass and reticule, but is small and hard to pick up.
I think most people would prefer having just a flat top picurweenie rail, with an Eotech or other optic of choice. But I'm going to go with what is on there for awhile and make a better decision after culling the herd a bit in the spring.
As far as the barrel is concerned, I found the original HBarrel to be quite front end heavy, especially with the new skelton stock. It was a very nice change/feel to have on the light barrel. In my opinion, the way it should.
The gas block is easily removed by knocking out the roll pins. Then I'm sure any competent smith or machinist could thread a flash hider on the front. I would be really tempted to have him contour the barrel to original diameter at the same time. But again, that's just me.
I picked up this G36E barrel for what I believe to be an acceptable price. I've seen them advertised for up $800

which I believe to be almost out of reach. But I've paid more money for stupider things

, so that's something each guy has to determine for himself. I'm thinking contour of the barrel and thread should be in the $150 range. Just a flash hider thread $25-$50ish. Guess it's who ya know too may help with the cost.