Hi all,
So I've been on a bit of a research and fps boost mission lately.
I've been looking at my array of Rifs on my rack and looking at giving a few a slight fps boost BUT they are all Marui and I dont want to open the gearboxes and let out the fabled marui magic dust.
Project A: TM high cycle Aug
I got a stock aug in a trade and it was firing around 250-260 fps.
I have swapped out the stock barrel for a zci 6.02 340mm barrel and a maple leaf rubber and omega nub and seen an increase up to 295-300 fps! Much better and no extra stress on the gearbox as I beleive it falls within the cylinder volume ratio.
Project B: Scar H
I have a Laylax (Prommy) 6.03 363mm barrel and hitting 302 fps on the dot almost every shot.
My query: I put this barrel in before I knew that different cylinders had different ports and therefore effects on barrels. Would this length be ok based on the stock marui cylinder or would it be detrimental?
Project C : Scar L
Completely stock.
I have a 6.03 300mm madbull tbb lying around to play with and was debating whether it was worth trying this for a night fps boost to 300+
Project D : 416
I had a stock tm 416 with a stock tm 363mm barrel that was initially a placeholder (I beleive it was that length) that I sent to firesupport for a fix (bolt release had stopped and trigger contacts were worn) and service. I asked whilst they had the gearbox open to see what the fps was and to try to get the fps to around 335.
It came back to me and I did a quick chrono and it was 335 on the dot for about 5 or 6 shots.
I have since re chronod today and to my surprise, hit around 10 shots at 335, then dropped to a 300 fps shot, then a few more at 335, then hit a 351 shot, then generally settled around the 335-345 mark with the occasional stray.
I put the augs stock 260(?)mm barrel and added a slight amount of hop tension; it settled around the 330-340 mark.
I belive that the hop rubber may have been slightly off centre causing some fps fluctuations. I will be changing the hop rubber for a maple leaf as I think the stock rubber is also slightly worn and flayed at the barrel end.
I need to spend an afternoon playing with the hop rubber and barrel to see if it is hop/seal issues that's giving such a fluctuation.
Of note; fire support had left the new springs wrapper I'm the box and I'm sure it was an m110 which I thought was too hot for 350 fps limits, bit it could have just been any wrapper used to wrap up the old spring.
My ultimate question;
What barrels (length and diameter) would people recommend for the Scars to get me at a good 300+ fps that wouldnt add stress to the gearboxes?
It's a hard science to nail down "what am bestest gun barrel for bestest fps" due to so many factors. I'm just trying to get a good list of peoples experiences that I can use to help make some decisions with.
I'm sorry if it's a very nooby question; i confess to being a bit of a tech divvy and i struggle with numbers!!
Tl;dr tm ngrs scar users; what tbb have you switched to and what fps differences have you seen?