PDI Inner Barrels

[Pointy]

Hi

Have a stock E&C K18 MOD 1 and looking to replace the inner barrel (along with hop-up bucking, maybe the hop-up chamber).

Any thoughts on a PDI 6.05 Barrel? Looks like I can buy from Japan (http://www.x-fire.org/e.index.htm) for about 6440 Yen (about $68 CDN).

What about the PDI 6.01 Barrel, about $90 shipped from x-fire.

The other barrel option would be the Prometheus 6.03 but the PDI barrels look to be cheaper, and have read some good stuff on them.

Thanks

[ILLusion]

PDI barrels are very good. Better material than the Prometheus. Both of them are manufactured to equal tolerances, and it's hard to go wrong with either.

Tighter bore = higher fps, but larger groupings.
Looser bore = tighter groupings, but lower fps.

6.03/6.04 seems to be the equilibrium point where people are willing to compensate on both performance characteristics, which is why the Prometheus barrels are so popular.

I recently did a barrel comparison between a custom made 5.98mm bore versus a 6.23mm bore short barrel to exaggerate the effect, and confirmed the above theory.

[Rusty Lugnuts]

Originally Posted by ILLusion

Tighter bore = higher fps, but larger groupings.
Looser bore = tighter groupings, but lower fps.

.

I found the same thing

[Pointy]

Thanks, I am really leaning towards the PDI 6.05 due to price;

• $64 + $18 USD shipping ($84 CDN) on a Prometheus 6.03 (RedWolf Airsoft)
• 5240YEN + 1500Yen shipping ($68 CDN) on a PCI 6.05 (x-fire.org)

From another forum someone was mentioning that the PDI "window is too short" and "quite deep" and this effects using certain hopups (for example R-Hop).

Anyone in the forum have similar experience?

What I really want is to buy one barrel once, which is why I am looking at a stainless steel barrel (like Prometheus and PCI). Want to make sure the barrel will be compatible with future upgrades.

[Stealth]

PDI barrels are indeed good and definitely on-par wit Prometheus.
What you read is indeed correct - the PDI windows aren't ideal for R-hopping. The aggressive trailing edge cut they do makes an R-hop install difficult but could theoretically mean you're 50% of the way to an ER-hop. LOL.

[ThunderCactus]

prometheus is the easiest barrel to Rhop ever lol
When Illusion refers to FPS changes in bore diameter, it's not that significant, maybe around 10-15fps only.
There's no conceivable reason to get a 6.01 over a 6.05 of the same quality when presented with the choice.

[Pointy]

I have to ask; Is the R-Hop worth the added expense ($16) of getting a Prometheus?

For the added $16 I can replace the existing bucking with a new Prometheus bucking unit.

[ThunderCactus]

prometheus hop rubbers aren't that good anyway lol
For all their high quality, no airsoft company makes everything good.
PDI-W rubbers are less expensive and better

Up to you if you want R-hop or not, really depends on who does it more than whether you have it or not.

[Pointy]

Originally Posted by ThunderCactus

prometheus hop rubbers aren't that good anyway lol
For all their high quality, no airsoft company makes everything good.
PDI-W rubbers are less expensive and better

Up to you if you want R-hop or not, really depends on who does it more than whether you have it or not.

I think you have just made this upgrade a whole lot easier for me!!!

The PDI Rubber (this one I guess) is about $5, and I like the split design within. In truth I wasn't really looking forward to messing with the R-Hop Install.

So a PDI 6.05 Barrel and 2-3 PDI Rubbers (for spares) and think I will be set for now.

Just want to make sure, the correct barrel is 285MM p/n 633088. Mine measures 284mm. (http://www.x-fire.org/etop/05.html)

Will likely get the Barrel Lockdown Kit from HunterSeeker Armoury

For reference below are some photos of the existing hopup bucking and chamber;









Please feel free to give your opinion on the hop-up chamber. Also please let me know if I should be get anything further to make the PDI barrel and rubber work.

[Stealth]

Despite us being the only HS5-authorized retailer in Canada, I can't whole-heartedly recommend the barrel lockdown kit. The really only good piece out of the kit is the self-shimming cone-wedge. The o-rings are standard and the front outer barrel wedge is too brittle and snaps easily.

Hop-up chamber looks okay, impossible to say how good it is without really testing it out. That hop-up mound looks ridiculous though. LOL

[lurkingknight]

actually I really wanted to try the HS5 barrel lockdown in my g36, the barrel and hopup keeps creeping away from the front of the gearbox in full auto and my fps is off. semi auto works great and is super accurate with the r-hop, but full auto the cone of fire is not as tight as my p90 and I've been trying to figure out why.

[Stealth]

Why not just get our o-ring pack?

[lurkingknight]

I did.. and it doesn't work the same way as an m4 because you have to push and twist the hop unit and it will spring back and lock in...which means if there's any orings in there you can't push it into the outer barrel collar to lock it in. If I pull them over the hopup unit lock it in and then roll the rings back in front of the hop unit, it doesn't tighten it enough.

Also, the secondary effect of the barrel lock on the g36 will also stabilize the inner inside the outer barrel assembly. There's a grub screw in the bottom of my g36 that when tightened to do this is either flexing my barrel or pushing it out of alignment with the exit of the surpressor so I shoot the inside of my surpressor when the inner barrel isn't properly shimmed

[Pointy]

Originally Posted by Stealth

Despite us being the only HS5-authorized retailer in Canada, I can't whole-heartedly recommend the barrel lockdown kit. The really only good piece out of the kit is the self-shimming cone-wedge. The o-rings are standard and the front outer barrel wedge is too brittle and snaps easily.

Hop-up chamber looks okay, impossible to say how good it is without really testing it out. That hop-up mound looks ridiculous though. LOL

I agree, from looking online my thoughts is the self-shimming cone wedge is about the only good item in the kit. O-Rings can be had at Home Depot fairly easily.

There isnt a lot of room between my inner and outer barrel at the front, so I dont think the the outer barrel wedge would be much help.

Just a thought - After installing the barrel shim to the hopup chamber, seal with some liquid gasket or silicone?

[lurkingknight]

depends on the silicone... gasket maker can be removed... not all silicones can be if you're talking like... caulking which you should not use.