I'm getting a hankering for a retro AR-15 (chrome-lined barrel, A1 stock and sights, slab side, triangular handguards, lightweight barrel, etc.). I found a number of used Colt Sporters chambered in .223 with a 1:12 twist, but I also found a slightly cheaper new retro reproduction non-Colt rifle with a 1:9 chromed barrel in 5.56 but with a round-assist and shell deflector. I suppose the question is, are there any Freepers with experience on the Colt SP1 who are willing to share their opinions on this rifle?