Long outer barrel for a shorter inner barrel

[TokyoSeven]

Who said anything about herpes, I just get cold.

[Amos]

Originally Posted by TokyoSeven

Youre a big fan of merkins thats what you are. Dont deny it, you want one.

I had to google that... Now I'm laughing.

Good show.

[TokyoSeven]

Do you remember that arcade with the 25cent whack shacks in the back we went into when we were in Vancouver? I'm totally convinced that the one vid we watched where the girl was getting double penetrated? I swear she was wearing a full merkin..then again it could have just been 1980s style pubes.

To everyone else just tuning into this thread now, Amos and I watch porn together after having romantic all you can eat Korean BBQ dinners. Then we go to strip bars to drink Heinekens and straight vodka

[rsiddiqi1]

okay so i have a jg M4 CQB-RIS i've had it since uhh november of 2013 and chronograph-ed with .20g bbs is was shooting 360-370ish so i recently bought a suppressor and i wanted to extend my inner barrel into the suppressor because i wanted the best accuracy so i bought a JBU 407mm 6.03 tightbore barrel after i installed it the next day i went down to my local cqb facility and asked to chrono it they told me 285-300fps i was shocked, then iasked the guy if i could test fire oon the field he said yes so i put on my mask loaded my mag and went to the field so i started shooting i was shooting 100ft to 150ft from a wall and i was amazed my accuracy was dead on the iron sights and the distance increased and it shoots 100X time better than it did before i put in my new inner barrel but can someone tell me why my fps dropped because during the installation i lubricant the barrel and bucking and the bucking isnt ripped so can someone help me and tell me why this is happened??

[ThunderCactus]

did you chrono it on .20s?
did you change cylinders to account for increased volume?

[rsiddiqi1]

i didnt add anything beside my inner barrel i was also told it could be a air leak, or that i ahve to lubricate the barrel i dont know what is going on??

[-=ArchAngel=-]

Originally Posted by rsiddiqi1

i didnt add anything beside my inner barrel i was also told it could be a air leak, or that i ahve to lubricate the barrel i dont know what is going on??

I think Thunder Cactus just told you why. If you only added the inner barrel, then u probably didnt change cylinders to take into account the increased volume you'll need to maintain the same velocity.

In other words, your barrel is so long, that the BBs are reaching peak velocity and then slowing down at some point in your barrel. In order to remedy this, you need a different cylinder that'll provide more volume.

[targetGspot]

As long as it's straight it won't hit the outer barrel. It should be like adding a silencer, I've not had an issue. My p90 silencer extended 4" further than the inner barrel and not once did a bb hit. Also, on an aug I had I swapped inner barrel out for a 650mm and didn't have to change anything else. It worked fine and gained 15fps. Accuracy and range seemed unchanged.

[rsiddiqi1]

well i went back down to my local cqb field and i told the gun smith to take a look at it i told him what had happened with the fps drop so he chronoed it with 20s and told me 290fps and then he opened my gun and took my inner barrel out and looked at it for a moment to see everything was right, so he adjusted my hop up, heavily lubricated bucking and slid it back in and then he, re assembled the gun and went to chrono it with .20g bbs again and this time i got most of my fps back it now shoots 350fps he told me that my spring could be worn out or they air could be leaking but he said that it should work fine and im going on friday to play airsoft to see how it works i hope this work thanks guys for your help and support

[rsiddiqi1]

he also told me that there are such barrels only for distance but installing them drops fps and increases range and accuracy, this is weird can anyone give me more information about this ??

[targetGspot]

I'm not the expert that some of the guy's on here are but switching to a longer tight bore barrel should give a small fps increase. The bb is then also kept in a straight line longer giving a accuracy increase. I was worried with my 650 barrel because there is a chance if you go too long without other mods that the piston will actually suck back the bb a bit and screw all of that up. As far as increasing range, combination of fps, weight of bb, and proper hop seems to be the key. Perhaps He's talking about the "new" wide bore barrels which some ppl are now swearing by but I've not seen one in action...