strawf3 Posted April 7, 2022 Report Share Posted April 7, 2022 A friend is putting together a AR10 using a standard hand guard using a traditional front cup and a delta ring in the rear. It seems that the hand guard is about .25" to long. Any ideas? Gene Quote Link to comment Share on other sites More sharing options...
Armed Eye Doc Posted April 7, 2022 Report Share Posted April 7, 2022 Welcome to the forum. Can you post some more details about the build and some pictures of the point of concern? That would help a bunch to get some suggestions. Quote Link to comment Share on other sites More sharing options...
blue109 Posted April 7, 2022 Report Share Posted April 7, 2022 Is it an actual armalite AR10, or a 308AR rifle of a different manufacture? Not all guns use the same length gas tube. Quote Link to comment Share on other sites More sharing options...
Steve crawford Posted April 7, 2022 Report Share Posted April 7, 2022 Those hand guards seem to be a very tight fit. Do you have a handguard installation tool? I had a lot of trouble trying to change the hand guard on my AR-15. It was easy after I got the handguard tool. My hands just were not strong enough to get the Delta ring down far enough to get the old handguard off and the new one on. 🥵🥵🥵 Steve Quote Link to comment Share on other sites More sharing options...
rpoL98 Posted April 26, 2022 Report Share Posted April 26, 2022 On 4/6/2022 at 2:46 PM, strawf3 said: A friend is putting together a AR10 using a standard hand guard using a traditional front cup and a delta ring in the rear. It seems that the hand guard is about .25" to long. Any ideas? Gene @strawf3 you need to use a barrel that uses the Armalite AR-10 gas tube length. I suspect your friend's barrel is one that uses the standard AR-15 gas tube length. for comparison, the AR-15 rifle gas tube is 15-1/8", the Armalite AR-10 rifle gas tube is 15-1/2". the extra gas tube length means the gas port is that much further forward, and consequently the gas block and hand-guard cap is also that much further forward, enabling use of AR-15 drop-in handguards. as an example, Faxon AR-308 barrels use the Armalite AR-10 gas port location, instead of adapting the AR-15 gas tube to their AR-308 barrels. Quote Link to comment Share on other sites More sharing options...
rpoL98 Posted April 27, 2022 Report Share Posted April 27, 2022 (edited) the AR-308 in the above picture uses a Faxon 16" Gunner barrel which is listed as "mid-length" gas system length, but in actuality uses the Armalite AR-10 carbine gas system length. The Armalite AR-10 Carbine gas tube is about 3/8" longer than the AR-15 mid-length gas tube, enabling use of AR-15 mid-length drop-in handguards in an AR-10 platform. this is all due to the taller barrel nut, evidenced by the bigger delta ring. Edited April 27, 2022 by rpoL98 clarification Quote Link to comment Share on other sites More sharing options...
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