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Posted: 4/1/2007 4:32:39 PM EDT
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Iam putting a Vltor low pro gas block on a 20'' bbl. -What rail type do I need FF or non FF. -With no FSB to lock into will there be much play in the rail? Thanks for the help. Semper FI. |
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If it's a low pro gas block, you need to free float it. 20" barrel, then I believe the gas tube is 12" I believe. You'll need a rifle length free float rail system/tube to cover the gas block and put a front sight on it. If you get a flip front sight/A2 fronts sight, make sure its the one for a rails, and not for a gas block because they are different hieghts. ETA: no play on the rail as long as its tight on the barrel nut. |
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There is a Vltor block in there some where, you are going to need a free float, a 12 inch will come up to the receiver end of the gas block on a rifle size gas system, you may see a little bit of the gas tube. a longer rail will cover up the gas block. pic below is a 16" mid-length with a 13.2" rail.  |
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