I havent tried it and I dont have the parts in front of me to try this so I will ask.

I ordered a Noveske 16" recon barrel for an upper build which took most of my budget (thats what I wanted to do so its ok). But I am gonna have to wait maybe a month on the FF handguards I want, but I am not gonna want to wait a month to shoot it. Can I use a handguard cap with a low pro Noveske gas block so I can throw on a set of plastic handguards for now?