[zip1234]

It is not the primary source of their weapons, nor is it the primary source of their explosives. It might be "a primary source" now as your linked article mentions, but certainly not THE primary source. Hamas is primarily given weapons by Iran.

[cess11]

They claim to be producing a lot of them locally in the Gaza strip, based on russian or iranian design. They've proudly showed videos of factories producing al-Ghoul rifles, Tandem anti-tank grenades, light artillery grenades, rifle ammunition.

This is an explicit ideal in the 'Resistance Axis', to develop the ability to produce military equipment locally and not be dependent on brittle trade routes or smuggling.

The West Bank seems to get rifles from several sources, both american style that probably comes from PA or IDF and russian style, probably smuggled through Jordan from Iraq, Iran, Russia. They produce IED:s locally, quite crude ones, not the directed type with concave copper plates favoured by iraqi militias. Eventually they'll learn to make those too, I'm sure.