*most vouched for user on hopup, buy with confidence! Follow for more great deals! Starting offer is $10 SHIPPED ($3 + $7 shipping). Gas block included! Also have other items so you can take advantage of shipping costs. Screws directly onto the upper. I cant get it to mount on any of my G&P uppers so I'm selling as is, no guarantee it'll mount on your uppers. Threads are in perfect condition, so it may just be my g&p uppers. Only contact me if paypal ready! Trades accepted as well!