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I'm not totally sure but I think you should annotate your onModelRegister with @SideOnly(Side.CLIENT). (I'm wrong. Stick with the post of diesieben07) But I know another thing. Your oxygen mask has a custom model and to use it you are overriding the getArmorModel method in your class. But you are creating a new model every tick inside this method with: ModelOxygenMask model1 = new ModelOxygenMask(); You should create your model in your client proxy.

Use the proper term, Beta. These are NOT alphas. Anyways, yes the point is that average users need to take 10 seconds to find the link if they want to test. But don't complain things are broken, PROPERLY report things so we can reproduce and fix.