[1.7.10] special crafting recipe does not work, not sure what causes it

[sigurd4]

i made a new special crafting recipe (it has its own class instead of using the normal way of making crafting recipes) and the first times i tried it, putting the materials in the crafting slots would cause a crash, so it is being called properly, i know that for sure and i have another crafting recipe that works and is called the excact same way, but with different arguments and of course with a different class. after i fixed that i realized that it didnt produce anything at all as if i didnt have the crafting recipe there at all! my code is a mess and i cant figure out what i have done wrong. can anyone help?

public class RecipeWeaponReload implements IRecipe
{
private int ammount;
private int ammoType;

private Item weapon;
private Item ammo1;
private Item ammo2;
private Item ammo3;

private ItemStack itemstack;

public RecipeWeaponReload(Item weapon, Item ammo1, Item ammo2, Item ammo3)
{
	this.weapon = weapon;
	this.ammo1 = ammo1;
	this.ammo2 = ammo2;
	this.ammo3 = ammo3;
}

@Override
public boolean matches(InventoryCrafting crafting, World world)
{
	ItemStack itemstack1 = null;
	ItemStack itemstack2 = null;
	int w = 0;
	int a = 0;
	int a1 = 0;
	int a2 = 0;
	int a3 = 0;
	int at = 0;

	for (int k1 = 0; k1 < crafting.getSizeInventory(); ++k1)
	{
		itemstack1 = crafting.getStackInSlot(k1);

		if (itemstack1 != null)
		{
			if(itemstack1.getItem() == this.ammo1)
			{
				++a;
				++a1;
				at = 1;
			}
			else if(itemstack1.getItem() == this.ammo2)
			{
				++a;
				++a2;
				at = 2;
			}
			else if(itemstack1.getItem() == this.ammo3)
			{
				++a;
				++a3;
				at = 3;
			}
			else if(itemstack1.getItem() == this.weapon)
			{
				++w;
				itemstack2 = itemstack1;
			}
			else
			{
				return false;
			}
		}
	}

	if(itemstack2 != null && ((w == 1 && a1 > 0 && a2 == 0 && a3 == 0) || (w == 1 && a1 == 0 && a2 > 0 && a3 == 0) || (w == 1 && a1 == 0 && a2 == 0 && a3 > 0)))
	{
		String t = null;
		if(itemstack2.getItem() instanceof ItemWeaponPistol)
		{
			if(at == 1)
			{
				t = ((ItemWeaponPistol)itemstack2.getItem()).ammo1Name;
			}
			else if(at == 2)
			{
				t = ((ItemWeaponPistol)itemstack2.getItem()).ammo2Name;
			}
			else if(at == 3)
			{
				t = ((ItemWeaponPistol)itemstack2.getItem()).ammo3Name;
			}
		}
		if(itemstack2.stackTagCompound.getInteger("Ammo")+a > itemstack2.stackTagCompound.getInteger("Capacity") && itemstack2.stackTagCompound.getString("AmmoType") == t)
		{
			return false;
		}
		else
		{
			this.ammount = a;
			this.ammoType = at;
			return true;
		}
	}
	else
	{
		this.itemstack = null;
		return false;
	}
}

@Override
public ItemStack getCraftingResult(InventoryCrafting crafting)
{
	if(this.itemstack != null)
	{
		ItemStack itemstack1 = ItemStack.copyItemStack(this.itemstack);
		if(itemstack1.getItem() instanceof ItemWeaponPistol)
		{
			((ItemWeaponPistol)itemstack1.getItem()).createNbt(itemstack1);
		}
		if(itemstack1.stackTagCompound.getInteger("Ammo")+this.ammount > itemstack1.stackTagCompound.getInteger("Capacity"))
		{
			itemstack1.stackTagCompound.setInteger("Ammo", itemstack1.stackTagCompound.getInteger("Capacity"));
		}
		else
		{
			itemstack1.stackTagCompound.setInteger("Ammo", itemstack1.stackTagCompound.getInteger("Ammo")+this.ammount);
		}
		if(itemstack1.getItem() instanceof ItemWeaponPistol)
		{
			if(this.ammoType == 1)
			{
				itemstack1.stackTagCompound.setString("AmmoType", ((ItemWeaponPistol)itemstack1.getItem()).ammo1Name);
			}
			else if(this.ammoType == 2)
			{
				itemstack1.stackTagCompound.setString("AmmoType", ((ItemWeaponPistol)itemstack1.getItem()).ammo2Name);
			}
			else if(this.ammoType == 3)
			{
				itemstack1.stackTagCompound.setString("AmmoType", ((ItemWeaponPistol)itemstack1.getItem()).ammo3Name);
			}
		}
		return itemstack1;
	}
	else
	{
		return null;
	}
}

@Override
public int getRecipeSize()
{
	return 1;
}

@Override
public ItemStack getRecipeOutput()
{
	if(this.itemstack != null)
	{
		return this.itemstack;
	}
	else
	{
		return new ItemStack(this.weapon);
	}
}
}