Originally Posted By: Firefighter Bill
Midway has the JP. Not for $175 though...... Are you gonna run an adjustable gas system?

midway

I will run Vltor upper attached to a White Mountain Barrel. I am not 100% sure on adjustable gas block? I know that with MY expereince with 223 pistols the .750 porting works best in 223. I have MADE gas blocks CYCLE better buy drill them out to .750, this has been my experence with short barrels. With the .750 I have drilled them out alittle before with a 7 inch spikes tatical pistol to make it cycle subsonic better. I think .840 was about what i drill the gas port out to. My thinking is with 9 inch barrell .750 will be ok. What your experiece with gas block size? I have run LWRC with their adjustable gas blocks, and REPR systems as well as the S&W mp-15 with gas block adjustable systems. What is the best subsonic gas block system???? As long as it ejects I will be happy! grin