Gas System Low profile anodized steel gas block with a cabin length gas tube.
A2 flash hider 5/8-24 thread with crush washer.
All our barrels for perfect gas port & gas block alignment and create a spot for the set screw to be recessed into and keep the gas block from rotating left to right or from front to rear. Precise gas port alignment is needed to keep your gun cycling properly.
All bolts used are fitted with a extractor spring O ring that improves and strengthens your extractor to remove the chance of a fail to extract the empty shell from the chamber.
Each upper comes with rail covers, 5 CPD stainless steel magazines [3-10 round and 2-5 round may be upgraded to 30 round magazines with additional $5 per magazine] free shipping. $80.00 of free product.