Inner Barrel changing

[freddyclaw]

I am looking into putting in an inner barrel that is tighter than a TM one in my G3 Sg1 but I am unsure what it would do to effect the performance would it increase grouping tightness? Would it create a jam more often or more commonly? Will it increase FPS and would it be bad if I left my gun stock other than that? I would plan on something like a 6.03 or 6.04 and 455mm because the length I have to work with I think is about 510mm to very tip of flash hider. The original inner is about 80mm from the end of the flash hider.
Thanks for any help

[Greylocks]

You're 15 and you have a G3SG1?

Okay...

Is it broken? Inaccurate? Grouping wildly? Is it stock or do you have other modifications in it?

[dontask]

Originally Posted by freddyclaw

if I left my gun stock other than

Grey
I think he has it stock

[Greylocks]

Yep, misread that bit.

Everything in an airsoft gun is a balance. You change one thing, you had better change the rest.

If your gun works fine as it is, my advice stands; dont touch it. Since you most likely cant play anywhere in Canada unless one of your parents is present, I would wait until there is a need to do more work on the gun they own.

If it's not broken, dont fix it.

[CDN_Stalker]

A tightbore will only ever jam on you if you either never clean it, or use crappy BBs with deformities or seams.

[dontask]

I'm also interested inthis topic (sorry for jacking this thread lol)
say if I put a 510mm 6.02mm tightbore in my stock AUG would the stock set up be able to run without any immediate/delayed problems?

[Greylocks]

If the barrel is longer than standard, you will have to do changes inside the mechbox; different piston sleeve, for example.

[Drake]

You generally don't have to change anything in the mechbox if you're adding a longer inner barrel, unless it's considerably longer (like going from a 6" MP5 barrel to a 20" rifle barrel). It's arguably worse for the mechbox if you do the opposite (cut down the barrel without switching out your piston cylinder for a ported one).

As CDN_Stalker stated, a tightbore won't cause jamming unless you're using crappy BBs.

FPS increases can happen when using a tightbore, but they're very small increases (~5-10 FPS) and generally only apply when comparing similar length barrels (although if you went for a longer barrel and also swapped out a ported cylinder for a non-ported one, you'd gain a bit there, too).

The most noticeable difference when using a tightbore is grouping. BBs will group much more tightly, which in turn does give you a longer useable range since your shots stay on target longer. When I changed my M4A1 to a Commando length barrel (11.5") I switched to a tightbore; the resulting shorter tightbore was more accurate using the same mechbox than the longer stock barrel.

Now specifically for the G3, despite what was stated by Greylocks, it already uses a full (non-ported) cylinder, so going to a longer inner barrel won't be a problem and does NOT require you to mess with the mechbox at all. You probably will have to modify the outer barrel a bit, however, to get it to fit. You may want to look into what's involved before going down that route.

[Greylocks]

If you really want range from an SG1, just add a slightly more powerful spring than standard. It does not take much. That and bushings should not cost much more than $60.

It's been so long since I had mine that I had forgotten about the cylinder.

Never found the great need or use for a tightbore myself, but some folks swear by them.

[freddyclaw]

Thank you for the help but I have one more question would a madbull 6.03 be an ok option to change to? I have noticed they are significantly cheaper and they are a better color if you were to see any of the barrel. and as Drake said would anyone have any advice on finding the way I would modify the barrel to accept a different inner or any experience? Thanks

[Drake]

Originally Posted by freddyclaw

Thank you for the help but I have one more question would a madbull 6.03 be an ok option to change to? I have noticed they are significantly cheaper and they are a better color if you were to see any of the barrel. and as Drake said would anyone have any advice on finding the way I would modify the barrel to accept a different inner or any experience? Thanks

Never used Madbull, but I've never heard anything bad being said about them so they're probably fine. As for size, I have a Prometheus 6.03 in my AR and it works nicely, but I can't honestly say I see much of a difference between it and my KM 6.04 or Systema's 6.05. There probably is some minute difference, but in actual game conditions the human factor really blurs the crap out of all that.

As for mods, I mentioned it cuz you MAY have to, but I never owned a G3/SG1 so I really don't know how your outer barrel is made. On the TM ARs, for example, the inner diameter of the outer barrel (the space where your inner barrel fits) is constant, ditto on my CA full length M16 outer barrel, G36, etc.; what that means is you could slide the inner barrel all the way out the muzzle without any problem (and also why you often see guys with M4s running longer barrels hidden in silencers).

But this isn't the case for all guns. My FAMAS has a sort of little "lip" at the muzzle end of the barrel, so you need to bore that out before you can fit a longer inner barrel.

So you need to check how your outer barrel is made.

[freddyclaw]

O that sounds like something alot easier than I thought it could be. Thanks for all the help I really appreciate it.