I have a preban style Colt AR. Its the screw style take down pin, no fence(flat mag well), the forward assist thats oval, it also has the flash hider with the holes in top/ the funky star washer and a 20" with old style sights and new round handguards. Its marked sporter II and has the SP w/ 3 as the first number. I really don't now the AR puritan way....I am a tactical guy but bought this a few yrs ago. Educate me on anything you can tell me