This kit is rockin!.. 1500rds without cleaning so far, bolt and upper stay super clean. Wipe my handguard off with a little CLP and snake the barrel, this thing just runs! I don't use the bushing or the spring. Just normal lube points and a dab of my trigger grease added to the bolt cam pin. I am running this with a Midwest Industries lightweight handguard and it clears the inside as good as a lowpro gas block. Not running suppressed but you can mag dump with a bare hand above the block without getting burnt by gas. A+ GEAR
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