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I just recently got my 300 built! I am using a custom made 8.5" Bartlein bbl that my brother chambered. pistol gas system with an adjustable gas block from tp555. LaRue 7.0 handguard and an SAS 30 cal suppressor.
making the LaRue handguard jive with tp555's gasblock was NOT fun. I had to grind the sharp corners off of the gasblock and totally dissassemble the block. I then had to do surgery on the handguard and remove some material. Assemble upper and slide the gasblock into place and reassemble it in place.
All in all it was worth it (I got what I wanted) .. but I aint rushing to do that again!
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