However, there is a very obvious, forward assist mechanism on the other side of the rifle, which is typical for a AR-15 platform.
There's talk within Indonesian Defense enthusiasts and forumers that this AM-1 is effort by Pindad CEO to subdue potential domestic private sector competition like from Komodo Armament.
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Komodo Armament assault riffle is clearly base on AR-15 design. I agree that only using pictures will not be sufficient to determine how much this AM-1 using base AR-15 design if any. My amateurs eyes perhaps see this more progressive development from previous SS-2 design. However I agree also not hindering possibilities they are combining it with AR-15.
They have forging capabilities which some of that actually inherited from previous Dutch East Indies Armament Workshops. The milling process and forging from what I gather is part of same Division/Business Unit. However they don't have metal or steel foundries on processing raw materials. That part still imported from my understanding, as no existing Metal and Steel foundries in Indonesia that specialized in weapon or mining grade barrels and pipes.
This is part of Indonesian MIC weaknesses, no enough supply chain that handle basic materials and metallurgical development. They are still doing back end and some middle part however not enough chain in Front end.
Add:
Video on Pindad milling and forging capabilities. They are more to cater solid metal like railroad and bridges. Thus not for specialized weapon grade barrels and mining pipes.
There's talk from what I gather for POSCO and Krakatau Steel JV (Krakatau Posco Steel) on branching toward weapons and mining grade materials. So far I don't see they are moving to there yet. Perhaps as this is very specialized materials foundries, which means not assess provide enough volume yet.
However for Indonesia MIC, means they are still facing weaknesses on building end to end supply chain domestically.