Criterion core 18" .223 wylde barrel with a superlative arms gas block. VLTOR MUR upper with forward assist. And other misc. Parts 1 sba3 brace, FCD od Green charging handle and magpul rifle stock. The bolt carrier is a fail zero. Bolt and barrel have been fired. Barrel lightly fired, bcg moderately used. Upper and lower are new. I perfer to sell this all as a single lot but willing to break it up. Barrel with block and bcg $400 (barrel new $329, gb $100) VLTOR upper $150 Charging handle $75 Sba3 $65 Zev lower and black sba3 (SOLD) Everything else listed is available