Although the video is quite dark we do get a good look at some of the DIY mortar bombs
Here we can clearly see that PTAB 2.5m cluster bomblets have been modified with new fuzes and new tail fins. This is the only example I've come across of this type of DIY mortar bomb, so it's unclear if this is just an experiment. It is of course extremely dangerous to handle unexploded cluster bomblets, and it seems these opposition members have managed to find a very risky source of new explosives.
Unexploded Cluster Bomblets Repurposed As DIY Rocket Warheads
Unexploded Bombs Used In A Truck Bomb By Jabhat al-Nusra
Clear Evidence Of DIY Barrel Bombs Being Used By The Syrian Air Force
Cluster Bomb Usage Rises Significantly Across Syria
The Mystery Of The Syrian Barrel Bombs
You can contact the author on Twitter @brown_moses or by email at email@example.com