Airsoft Canada - View Single Post - GBBR

ThunderCactus · July 30th, 2015, 12:31

The air volume for a gbbr is actually controlled by the poppet valve or npas. So simply going to a longer barrel may increase fps, but it might also actually cause you to joule creep in reverse.

Start off by chronoing your gun on .28s or whatever field bb you use to determine if you really are under the field limit, then extend the barrel and perform the same test to double check.
i know with the kriss vector, when you use a longer barrel it actually REDUCES the muzzle energy on .30s quite a bit due to the tiny gas volume used to fire the bb.

Second, your bbs shouldnt be hitting the suppressor at all, very especially within only 3 inches. Removing that wobble in your inner barrel will also increase your accuracy at range. If you test your accuracy with and without the suppressor it will be very noticable if the bbs are hitting the aperture or walls on it.
BBs hitting the inside of a suppressor are usually due to misfeeds and suppressor wobble. If you dont have at least a 6mm grouping 3 inches from the end of your barrel you've got some serious issues. I once had a suppressor with a 6.5mm aperture 6" from the end of the barrel, never had a strike on it.

July 30th, 2015, 12:31	#5
ThunderCactus Not Eye Safe, Pretty Boy Maximus on the field take his picture! Trader rating Join Date: Feb 2007	The air volume for a gbbr is actually controlled by the poppet valve or npas. So simply going to a longer barrel may increase fps, but it might also actually cause you to joule creep in reverse. Start off by chronoing your gun on .28s or whatever field bb you use to determine if you really are under the field limit, then extend the barrel and perform the same test to double check. i know with the kriss vector, when you use a longer barrel it actually REDUCES the muzzle energy on .30s quite a bit due to the tiny gas volume used to fire the bb. Second, your bbs shouldnt be hitting the suppressor at all, very especially within only 3 inches. Removing that wobble in your inner barrel will also increase your accuracy at range. If you test your accuracy with and without the suppressor it will be very noticable if the bbs are hitting the aperture or walls on it. BBs hitting the inside of a suppressor are usually due to misfeeds and suppressor wobble. If you dont have at least a 6mm grouping 3 inches from the end of your barrel you've got some serious issues. I once had a suppressor with a 6.5mm aperture 6" from the end of the barrel, never had a strike on it.