if you're getting an m4 or m16 style hop up, I strongly suggest the king arms metal enhanced hop up chamber. 35$ for everything except the bucking. It's a one piece metal chamber, but that isn't where it shines.... It's how sound and sturdy the barrel sits in it.
That's makes a good hop up;
When you put the barrel and hopup chamber together, you want the bucking to be as straight as possible to the horizon when it's engaged. Otherwise, your bb's will curve left or right depending on which side of the bb is getting more contact with the "bump" above it, which is the bucking.
You might look down your barrel through the hopup (when It's out of the gun, never when it's assembled) and see the bucking is perfectly straight, but if there is any wobble or play with any of the parts, the way it is in your hands probably won't be the same as when it's been assembled in your gun. Vibrations and compression from firing as well as mags being inserted and pulled out can throw it off.
Again, I've had great results with the king arms enhanced hopup chamber. It's metal (METAL!), and nothing budges when It's all together.... I'm sure you can't go wrong with the prommy one, but I'm guessing it's way more expensive because, well let's face it, it's prommy, the dolce & gabbana of airsoft.
heres the chamber i got, in 2 days!!!
http://www.airsoftparts.ca/store2/in...roducts_id=514
For buckings, I'm using a guarder clear silicone..... I really don't know which is the best, but I'll tell you one thing, I'm NEVER going to pay 15-20$ for a bucking... that's just ridiculous... I think if someone assembled a gun with a 6$ systema bucking or guarder clear silicone (or any reputable bucking in that price range) and made I video comparison test for accuracy with the same gun with like an expensive firefly bucking there wouldn't be much of a difference... It probably might perform better, but not much better. And ESPECIALLY not 3x times better, because it is 3x more expensive after all.
Just get a reputable one, read reviews, and i guarantee it'll be much better than the stock one. Even my 600 dollar VFC hk416's stock bucking sucked. You'll know when you replace it
happy and careful modding!
-Adam