Open chamber WE M4/Scar/PDW/G39/l85

[MultipleParadox]

Got it
Thanks (by the way, I did place an order for an OEM chamber through Taktik, thanks Kos-Mos)

[cav.]

RA-Tech released new steel bolts

[turok_t]

Here are some preliminary results of the steel hop up chambers:

1. The hop up chamber is significantly smaller cause it to be loose within the chamber ring as shown here:



2. The stock nozzle fits tightly within the hop up chamber which may be problematic for cycling. I will find a solution to rectify this issue.

[Kos-Mos]

Originally Posted by turok_t

Here are some preliminary results of the steel hop up chambers:

1. The hop up chamber is significantly smaller cause it to be loose within the chamber ring as shown here:

The most obvious solution to this would be for the manufacturer to include a replacement sleeve or update their model to fit snug in the WE ring. It's not like there is a lot of variance from one gun to the other, so I don't know how they can have messed this...

Originally Posted by turok_t

2. The stock nozzle fits tightly within the hop up chamber which may be problematic for cycling. I will find a solution to rectify this issue.

Both of theses issues combined, I feel like the machining did not factor the thermal expansion of the steel barstock after a few units made, and you got one of the last from the bar (when the bar was really hot, due to bad/insufficient cooling maybe), and it shrink when cooling off...

I have seen up to 0.015" per inch of diameter change...

However theses don't seem to be fully CNC from a barstock, more like cast.
In that case, they would have simply fudged the calculations... there is always a lot of shrinking when casting parts.

[tome]

Hi,

Anybody got any ideas on what to do if the thread at the bottom of the v2 mag strips so that the screw provided isn't long enough to engage the thread to keep the shell on?

Cheers
Tom

[Kos-Mos]

Originally Posted by tome

Hi,

Anybody got any ideas on what to do if the thread at the bottom of the v2 mag strips so that the screw provided isn't long enough to engage the thread to keep the shell on?

Cheers
Tom

Put some baking soda in the hole, followed by a drop of crazy glue and install the screw back in.

It's an old trick to "fix" smallish threads in RC cars.

[tome]

Originally Posted by Kos-Mos

Put some baking soda in the hole, followed by a drop of crazy glue and install the screw back in.

It's an old trick to "fix" smallish threads in RC cars.

Thanks for the tip

Just to check, I will be able to unscrew it when the time comes to dismantle and relube the mag right?

[Kos-Mos]

Originally Posted by tome

Thanks for the tip

Just to check, I will be able to unscrew it when the time comes to dismantle and relube the mag right?

3 years and I have never opened any of my 12 mags.

There is no reason to open them (unless you burried them in fine sand).

Mixed oil on propane/GG lube the mag and valves plenty.


But yes, you will be able to unscrew it. It will break the baking soda/glue, so you will have to clean the hole a bit and reapply the above.

[tome]

Originally Posted by Kos-Mos

3 years and I have never opened any of my 12 mags.

There is no reason to open them (unless you burried them in fine sand).

Mixed oil on propane/GG lube the mag and valves plenty.


But yes, you will be able to unscrew it. It will break the baking soda/glue, so you will have to clean the hole a bit and reapply the above.

Cheers. I know most people don't open their mags but if my mags develop a leak I like to take the valve out and just rub a bit of silicone on the O-rings to keep from silicon being blown into the hop rubber. Maybe it's a bit over the top but I like it :P

[Kos-Mos]

You know you need silicone oil to blow in the nozzle to lube the nozzle o-ring.
It will get in the hop-up chamber regardless what you do.

Also, if you lube your gas enough, and always leave some in your mags, you won't have leaks developing... as I said, 3 years and 12 mags without leaks.

[MaybeStopCalling]

Installed the Steel Hopup. Had to shim it by making a new chamber ring out of a Fenix Flashlight Clip, but the end result is a perfect fit. Rifle functions flawlessly with 100 rounds through it.

[turok_t]

Originally Posted by MaybeStopCalling

Installed the Steel Hopup. Had to shim it by making a new chamber ring out of a Fenix Flashlight Clip, but the end result is a perfect fit. Rifle functions flawlessly with 100 rounds through it.

Have you checked the FPS before/after you installed the steel chamber?

[MaybeStopCalling]

Originally Posted by turok_t

Have you checked the FPS before/after you installed the steel chamber?

Sadly my chrono is MIA. Recoil seems stronger, noticed a lot less dribbled/weak shots. This may be less the new unit and more that my old chamber was beaten into a mangled pulp.

[Kos-Mos]

It's a long shot, but anyone has a spare M4 upper IN MONTREAL or close enough to arrive before the week-end?

I found out mine was broken at the delta ring threads... and well I planned to field the gun Sunday... I really would appreciate not having to pull the old sewing machine out.

PM obviously.

[MaybeStopCalling]

Sent. Not sure what I have is what you're looking for, but it can't hurt.