Airsoft Canada - View Single Post - Is this a good way to swap from CQB to Field?

m102404 · February 14th, 2013, 11:25

I used a longer sig length inner barrel and adjusted the ported cylinder mechbox to shoot 400fps w/0.20's. Then, when I switched to a shorter (just sub CQBR length) inner barrel/hopup I found that my FPS was 340fps w/0.20's

I was using a Madbull JP rifle setup where the outer barrel has various detacheable sections to go from just in front of the gas block out to 15-ish". You could do a CQBR barrel length and then use a suppressor to cover the longer inner for field use.

I did have multiple uppers for a single lower...but in the end it was just easier to drop out the hopup/inner and swap in a different hopup/inner and attach/detach an outer barrel length as needed.

This type of setup worked in a number of M4's that I built.

So...if you're going to do this...take your longer inner barrel length, adjust velocity to your upper field range 380-400 and then use a short barrel to kill off velocity.

February 14th, 2013, 11:25	#7
m102404 Tys Trader rating Join Date: Apr 2006 Location: Toronto	I used a longer sig length inner barrel and adjusted the ported cylinder mechbox to shoot 400fps w/0.20's. Then, when I switched to a shorter (just sub CQBR length) inner barrel/hopup I found that my FPS was 340fps w/0.20's I was using a Madbull JP rifle setup where the outer barrel has various detacheable sections to go from just in front of the gas block out to 15-ish". You could do a CQBR barrel length and then use a suppressor to cover the longer inner for field use. I did have multiple uppers for a single lower...but in the end it was just easier to drop out the hopup/inner and swap in a different hopup/inner and attach/detach an outer barrel length as needed. This type of setup worked in a number of M4's that I built. So...if you're going to do this...take your longer inner barrel length, adjust velocity to your upper field range 380-400 and then use a short barrel to kill off velocity.