I also own a 527 M1, .223. Very accurate sub-MOA shooter with factory ammo and 40 gr. V-Max, as well as Federal 62 gr. Fusion ammo.
I mounted mine with a Burris 4.5-14x scope in factory rings, and replaced action and ring screws with allen-heads. Great rifle!

I'd rather be a free man in my grave, than living as a puppet or a slave....