...the upper stock screw isn't vented.

I wouldn't care except that so far, no upper I've tried will cycle far enough to load a second round

Can I swap this Alen head screw out for the vented A1 stock upper screw you have (I assume still) listed on your site

ETA: It appears you guys don't answer on here, so I emailed tech support as well.

I posted this and emailed Friday. It's Wednesday now and I haven't received a response from either.

I know you're company is very busy. Ive been using you guy's parts for over 10 years. I'm not worked up about a screw, but could someone from CMMG at least tell me if I need to order one elsewhere or not?

Also, if you don't include it, please update the description on your A1 stock sets so others can make arrangements.