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cant tell you how much your gas block helps on the AR 300 platform. Running a 10.5 300/221 barrel and 3 pos tp555 block, 1.25 gas port, semi auto BC, old school light weight carbine buffer (plastic looking one), loosest car spring I could find (get an old one you have put a lot of rounds through) , and a tuned jewell trigger makes for one excellent sub or supersonic setup. One thing I learned using the low pressure setting is that the weapon will not cycle without the assistance of my suppressor with 950fps 220smk's. which I got to cycle the bolt all the way down to 7.2g of acc#9, OUTSTANDING!!!! Without your gas block you would be hard pressed to formulate a setup which gives both sub and supersonic cycling without a major part change on the rifle. Thanks again tp555 and for you people that are having problems, you need to give them a shot. Also the completely closed setting is awesome for some truly quiet shooting!!!
Thanks again TP555
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