concretus Posted January 17, 2018 Report Share Posted January 17, 2018 Hello, I have an Alex Pro Fab AR10 with the 18" medium contour barrel. It has their proprietary T-mod hand-guard 1.9" O.D - 1.70" I.D... It works and looks good but I was considering installing one with smaller diameter. Are these DPMS compatible? According to the Midwest Ind. web site, it is a high profile type. Are there any hand-guards available for that will allow the rail on the hand guard to continue from the upper at the same elevation? Has anyone encountered this? Will I have to replace the barrel nut also? With a narrower hand-guard, will I have to replace the gas block even though it is one that the hand-guard floats over? It loos like there is clearance inside this one now..Any help would be appreciated. Thanks Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted January 17, 2018 Report Share Posted January 17, 2018 You might be best off calling the manufacturer and asking what thread pitch your upper receiver has. The AR10 and LR308 have conflicting threads. You need to know which you have. You will almost definitely have to replace your barrel nut. Very few handguards are compatible with other nuts. Generally a “low profile” gas block is universal. Unless there’s something proprietary about it. Quote Link to comment Share on other sites More sharing options...
concretus Posted January 17, 2018 Author Report Share Posted January 17, 2018 2 hours ago, Robocop1051 said: You might be best off calling the manufacturer and asking what thread pitch your upper receiver has. The AR10 and LR308 have conflicting threads. You need to know which you have. You will almost definitely have to replace your barrel nut. Very few handguards are compatible with other nuts. Generally a “low profile” gas block is universal. Unless there’s something proprietary about it. I do know the upper is DPMS compatible if that helps.... Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted January 17, 2018 Report Share Posted January 17, 2018 Do you use a top rail?? Check out APEX CNC. You don’t want too thin. These heat up fast when you’re playing hard. Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted January 17, 2018 Report Share Posted January 17, 2018 You need to measure if you have a high receiver or a low receiver. Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted January 17, 2018 Report Share Posted January 17, 2018 Quote Link to comment Share on other sites More sharing options...
concretus Posted January 17, 2018 Author Report Share Posted January 17, 2018 29 minutes ago, Robocop1051 said: It is the thicker one of the two.... Quote Link to comment Share on other sites More sharing options...
survivalshop Posted January 17, 2018 Report Share Posted January 17, 2018 High rail height , pre - 2009 DPMS height . Quote Link to comment Share on other sites More sharing options...
concretus Posted January 18, 2018 Author Report Share Posted January 18, 2018 5 hours ago, survivalshop said: High rail height , pre - 2009 DPMS height . Guess I should have taken these a while ago to help.... Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted January 18, 2018 Report Share Posted January 18, 2018 You won’t get much thinner on the .308... but you will get LIGHTER. Quote Link to comment Share on other sites More sharing options...
concretus Posted January 24, 2018 Author Report Share Posted January 24, 2018 (edited) I decided to go with the DHM from Midwest Ind. https://www.midwestsupplygroup.com/midwest-308-ss-series-15-dpms-m-lok it's a little narrower and about 6 oz lighter.... Edited January 24, 2018 by concretus Quote Link to comment Share on other sites More sharing options...
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