I recently purchased a NIB Remmy .308 5R, but I'm buying aftermarket parts to make it "better". I'm thinking about replacing the current(factory) recoil lug. My question is.... will any recoil lug other than what came from the factory change the head spacing or cause me to change something else? I don't claim to know a lot about how guns work, internals, ect., but I do know how to use them. If I'm asking the question wrong or am completely off base please help me to understand better. The reason I ask is because someone told me "if you change the recoil lug, it will change your head spacing, and require mil work." Thanks in advance for the insight.