I'm toying with putting together an M16A4 MWS clone and I'm wondering what you guys think of CMMG uppers? They seem to be the only manufacturer (that I can order from online) that carries a complete 20in upper with a 1/7 twist barrel, but it's pricey at $575. If I stick with a 1/9 I can get a 20in uppper from Del-ton for $395. Are the CMMG uppers worth the premium? Or perhaps someone can recommend another upper with a 1/7 barrel?