Tony G.

I don't want to bash the company this is more of a post to ask for advice and see if others have the same issues I'm experiencing.
I ordered 2 300blk side charge uppers about 8 months back but haven't fired them. This is because I've noticed that there is an issue feeding, I have loaded several different mags and when I pull back on the side charge it never goes all the way home. Of course because there isn't a forward assist, I can never get the bcg to fully go forward. I have tried several mags and mainly have issues with pmags so I have to drop the mag clear it and try again. On some of my older metal mags I can cycle about 2-3 rounds just pulling back the charging handle and then it gets stuck.
I have also tried these mags in some of my rear charge and they work just fine. I'm not sure at this point if it is the upper or maybe the buffer spring, or possibly the bcg but I'm not sure what it could be.
Overall, the customer service I can't speak on because I haven't dealt with them but I do remember the shipping was quick. Just wish these would work and I'm hoping the company has an idea of what it could be. Again not bashing them I'm sure it's something minor but need ideas.