M120 spring + 11.1 20C LiPo + 15k rounds = ...

[Nec]

Jester, may I recommend drilling relief holes next time. This helps save the gearbox by dissipating the impact energy of the piston over a wider area. See picture.

[DJ]

dry firing your weapon causes no harm. A bb being present or not does not releave stress on the gearbox front end. It does not act as a cushion.

This. I've never understood why so many people think dry firing is so bad...

Its probably due to the fact that on so many real guns it is not good. Some tolerate it (Glock) a lot of older guns do not. Many folks just assume that to be the case for airsoft too?

[Jester316]

The initial compression of air before the bb starts to move does in fact slow down the piston (not much but it does).

Anyone who knows me, knows that I'm not easy on my guns. My CA SCAR failed this exact same way (of course, I used that as a SAW...).

I know that V2's will break like this. I'm just pointing out to others, that although you can run a lipo in any gun, it'll increase the likely hood of a failure like mine.

[Russkie]

I know that V2's will break like this. I'm just pointing out to others, that although you can run a lipo in any gun, it'll increase the likely hood of a failure like mine.

That is a very valid point.

[Blizzard]

Jester, may I recommend drilling relief holes next time. This helps save the gearbox by dissipating the impact energy of the piston over a wider area. See picture.

Do you have proof that actually works? It's an interesting concept at least.

[Nec]

Jester, may I recommend drilling relief holes next time. This helps save the gearbox by dissipating the impact energy of the piston over a wider area. See picture.

Do you have proof that actually works? It's an interesting concept at least.

I don't have any real proof through testing with gearboxs, no numbers or pictures, although I've done it on all of my Ver2 gearboxs that show signs of cracking. This isn't a new concept, it's called "stop-drilling" and is used in the areospace industry for this very same purpose. Sharp corner are more prone to cracking than rounded corners.

[Blizzard]

Interesting, I think I'm going to try that.

So you said they were showing signs of cracking. Did they eventually bust after this mod?

[CommieHunter]

V2 gearboxes can run just fine on an M120 or M130 on an 11.1v lipo, but you have to do it right.

A HUGE issue is having radiused corners on the front of the cylinder cutout area. If you look at the edges of the mechbox cutout where Jester's cylinder sits, the corners are square. This means that all the force is directed perfectly at the joint of the corner, causing it to eventually crack. If these corners had been radiused, were a small circle is cut out right at the corner, the curve spreads out the force and prevents cracking. Good quality mechboxes come like this and rarely crack.

[Switchback]

Its probably due to the fact that on so many real guns it is not good. Some tolerate it (Glock) a lot of older guns do not. Many folks just assume that to be the case for airsoft too?

I was under the impression that only rimfire rifles did not tolerate dry firing. My centerfire rifles do not have any problem, nor have I heard of a damaged firing pin due to dry firing a centerfire.

[ogrejager]

Its probably due to the fact that on so many real guns it is not good. Some tolerate it (Glock) a lot of older guns do not. Many folks just assume that to be the case for airsoft too?

I was under the impression that only rimfire rifles did not tolerate dry firing. My centerfire rifles do not have any problem, nor have I heard of a damaged firing pin due to dry firing a centerfire.

Well, then, you need to do some more research. 5 minutes with google ought to school you to the "it depends" category rather than "rimfire only."

We are officially offtopic, sorry Jester.

[Switchback]

Well, then, you need to do some more research. 5 minutes with google ought to school you to the "it depends" category rather than "rimfire only."

We are officially offtopic, sorry Jester.

Will do; thank you very much!

[Minerva]

Well since you didn't seemed to like the CNC'd machined idea I threw out there, you might want to look into sorbothane padding your piston head and cylinder. You can use the sorbo to correct AoE too and it really does relieve the impact and cause a HUGE decrease in stress. It also oddly makes the gun alot quieter..