I agree with US019255. Your M1 was meant to deliver 150 gr bullets downrange. Seems like it does what it was intended to do. I have a post Korean War HRA M1 that is a great shooter. It didn't land at Normandy or fight in Korea, but it is still a M1. Because I shoot my M1 I can experience--somewhat-- what my uncles experienced in France and Germany in 1944-45. albeit without the return fire.
I bought a Blue Sky M1 Carbine a few months ago from the LGS. It also shoots straight alike yours nd has tight groups. Like any 60+ year old rifle, you have to look for condition. I look at milsurps as shooters, not safe queens. Maybe if I could trace a particular rifle to a specific historic person in a specific battle, that might be different. But, I don't own a true historic rifle.