Congrats, I love my PTR. Get yourself an hk21 charging handle and it’ll change the experience completely. A PCS heavy buffer is a great option for recoil management and it drops right into the factory stock. But really the BEST thing you can do is send your trigger off to Denny Williams (Williams trigger specialties). He did an SG1 set trigger for me and it’s similar to the SSAE on my mk18.