Since the Magpul hand guard comes around the gas block, a railed gas block might not even fit.
Yup..Why on earth would you want a railed gas block?
If you're wanting to keep the factory plastic hand guards, get a gas block with an integral flip up front sight like a PRI.
I guess I should be more specific. I want to remove the factory gas block and put a quad rail gas block on it.
Why? I have a RRA AR with the railed front gas block. It has been a PITA to get a gas block height front sight. At 1st I put a hand guard height front sight on my quad rail handguard... I didn't like it at all, slower sight picture acquisition. Why sacrifice an inch of distance between your front and rear sight?...That will just make you less accurate.
I picked up a "flip" front sight to go on the gas block yesterday, and sighted her in and ran 200 rounds through her today... I don't see any real advantage to having the railed gas block with a flip front sight. It is much heavier than a standard front sight/gas block.
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