moagm316 Posted July 10, 2012 Report Share Posted July 10, 2012 Because I have the MA-Ten upper I purchased a DPMS 12" TRX rail. I am trying to decide between the 18" or 20" armalite pattern Rainier arms barel. the 20" has a rifle length gas system and the other has the carbine length gas system. Will my hand guards cover the gas block on the 20"? Quote Link to comment Share on other sites More sharing options...
Jgun Posted July 10, 2012 Report Share Posted July 10, 2012 I don't think so. I have a DPMS pattern, rifle length gas system, .308 AR. The front of my my low pro gas block is just covered by a Larue AR 10 rail that is marked 13.2, but actually measures closer to 13.875" from the front of the upper to the front of the rail. Besides this, the Armalite rifle length gas port location is approximately .250" further forward than the DPMS rifle length, if I remember correctly, so I'd say that a 12" rail will not only NOT cover your GB, your going to have some of your gas tube exposed as well. If your looking to cover the gas block with that rail, I think you'd have to go with a carbine length gas system. Quote Link to comment Share on other sites More sharing options...
washguy Posted July 10, 2012 Report Share Posted July 10, 2012 Jgun is right on....trx wont cover the rifle length :)Wash Quote Link to comment Share on other sites More sharing options...
soofley Posted July 10, 2012 Report Share Posted July 10, 2012 yip what they said^^^ you gotta get a handguard thats 13+inch in length.I's got a 12" DD Lite and the gasblock is outside the handguard Quote Link to comment Share on other sites More sharing options...
338FedAR10 Posted July 11, 2012 Report Share Posted July 11, 2012 13.8 Trx comes flush with the outward end of my badger ordinance low pro block. Quote Link to comment Share on other sites More sharing options...
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