How does this gas block attaches to the barrel? Just tension screws or the barrel is somehow modified?
I believe this is just being used as a front sight base and not a gas block. You may want to check with RRA but I believe it is attached only with set screws.
My idea is to remove this gas block and install a BCM "F" FSB with 1/8" straight pins.
That being said I would purchase a complete 9mm CAR upper with a "F" FSB that is pinned in place, and the handguards or rail system that you want, directly from the factory.
If you want the barrel shortened for a SBR, and a 9mm hammer installed, or the bolt ramped for use with a standard semi auto hammer, you can have these things done by any competent AR smith.
Or better yet ADCO firearms makes a SPR version of what you want and they can ship it with a pre ramped bolt or a 9mm hammer and buffer, which ever you prefer...
Just my .02
MossieTactics.com ~ KMA 367
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