From militaryfactory.com
Pindad SS1 Assault RifleWhile an Indonesian Army service rifle, the SS1 is based on the Fabrique-Nationale FN FNC series and produced under a local license.

=====
Pindad SS2 Assault Rifle
The Pindad SS2 series assault rifle is a modernized version of the original SS1 model, itself based on the Belgian FN FNC family.
From:
Military TodayThe Senapan Serbu 2 or SS2 is a first Indonesian-designed assault rifle. It was developed to replace the previous SS1. The new assault rifle and has a number of improvements. Tests of the new weapon have been conducted during 2003-2005. Production of the SS2 commenced in 2005. Deliveries to the Indonesian armed forces commenced in 2006 where it replaces the older Pindad SS1. Over 25 000 SS2 assault rifles were produced for Indonesian armed forces. This weapon is being proposed for possible export customers. Some sources report that it has been exported to Cambodia, Malaysia, Mali, Myanmar, Oman, Philippines, Saudi Arabia and possibly some other countries.
The Pindad SS2 is based on the previous SS1, which in turn is a license produced version of the Belgian FN FNC. It has a number of improvements, including an integral scope rail. The new weapon has a rounded ribbed foregrip with heat ventilation holes. It improves barrel cooling during sustained fire. The Pindad SS2 is slightly lighter than its predecessor. Also it has a longer barrel and is slightly more accurate. The weapon has some features of the US M16 assault rifle. Barrels for this rifle were originally produced in Germany. However later due to arms embargo Pindad switched to South Korean made barrels.

The Pindad SS2 is Indonesia's first locally made assault rifle