Updated SPR.
So, from the last time I posted this I've replaced the upper and lower receivers, new stock, new barrel, new bipod, and that's it I think.
Upper Receiver:
Vltor MUR
BCM KMRA-13
White Oak 18" SPR, RL Gas, 1:7 Twist
PRI QC Brake
Aero Precision Low Pro Gas Block
BCM Gas Tube
BCM...