Hop-Up Rubber Sleeves (Bucking)
 

I modified my SIG SG 552 which has the GWS SIG SG 556-Sniper Conversion Kit and 650mm inner barrel. It shoots about 440-450 FPS on 0.25g BB's.

I have a Firefly Hop-Up Rubber Sleeve (Hard Type) and a Prometheus Hop-Up Rubber Sleeve (Hard Type). The Prometheus feels stiffer than the Firefly. Which one would be better to use on my setup?

Use the stiffer one.

But the firefly has the H-nub effect!!

Personally, I'd use the firefly... They make SUCH amazing rubbers (but they do require about a 200 round break-in period)

Also, Do you have a bore-up kit in your gun? Because if you don't... your range is gonna suffer!

Yeah, that was what I was thinking. After all, I paid double for the Firefly Hop-Up Rubber Sleeve than the Prometheus! But the stiffer Prometheus just confused me a little.

Yes, I do have a bore-up kit on my gun. After talking to ILLusion, he was telling me that I would need one if I get the 650mm inner barrel.

Excellent.

Use the firefly rubber. They're amazing. I use one in my VSR-10 and I'll be using one in my AEG once it arrives :)

i never got that great of an accuracy from Firefly, I'd use the Prometheus

Well, from 30 feet away, with the Firefly Hop-Up Rubber Sleeve (Hard Type) and Firefly Hop-Up Buffer Rubber (Normal Type), I'm getting 1.5-inch groupings right around the center of the target. Not the optimum distance to test out accuracy, but that's all I got to work with. I'll test out the Prometheus and post back.

You may not get the greatest accuracy, but you'll get a greater distance, and when you've got a semi-auto sniper rifle, it favors distance over pin-point accuracy.

I can get 0.8 inch groupings(Measured) at 30 feet with a Prometheus or Guarder hop up rubber(or G&P, or TM).

0.9 inch at 40 feet, that was with G&P hop up rubber with Laylax Strike Chamber. Honestly Firefly lacks the consistency in shots

Really?

My VSR gets about 3-4" at 150 feet with a firefly bucking.

I find that the softer the bucking, the better the accuracy. As well, the harder the bucking, the more hop up is required to keep a level tajectory, and this actually causes you to loose fps.

As an experiment, take an AEG with a hard bucking and turn the hop up right off, then crony. Then set you hop up so that you get the standard flat tajectory you'd expect to game with, then crony.

I have noticed some varients of up to 25 fps doing this with 0.20s.

SHA DO

I noticed the exact opposite

Enjoy trying to field that gun at your local games, 440-450fps with 0.25g BBs is gonna net you around 470fps w/0.20g at the chrony.

I've noticed the same as Sha Do has. Depends on the gun, set up and ammo I guess. I was able to get my 360fps w/0.20g BBs MP5 to print a bit bigger than man sized clusters of 0.28g BBs at 200ft using a Guarder clear a couple years ago, and that was with the stock TM inner barrel.

My VSR-10's a freak.

Hop off it fires 400 FPS

If I crank the hop to max I get 465 FPS... My thoughts on this is that the BB gets held in place longer so more pressure builds up behind it... but other than that It's a head-scratcher.