crackback 135 Posted March 27, 2010 Report Share Posted March 27, 2010 (edited) I thought I would start this topic because I was curious about them pertaining to any future Title II collection I or any of us may have. For those not familiar with the term, DIAS refers to Drop-In-Auto-Sear. This little but extremely valuable chunk of metal +/- spring are currently most populous in the AR15 and HK line that existed in 1986 (MP5, G3, etc. ) This part is considered a machine gun by the ATF and is transferred and registered as such. With all other full auto parts (save the auto sear of course) installed a Registered DIAS can legally convert a semi-auto AR to full auto/3rd burst without any receiver modifications (provided it is of the "low shelf" variety. Any input from the community out there to the pros and cons to this route vs a traditional registered firearm for inclusion in a collection would be appreciated. Edited March 27, 2010 by 690gr Quote Link to post Share on other sites
KrisFox 69 Posted March 27, 2010 Report Share Posted March 27, 2010 You can't use this with a RR. Quote Link to post Share on other sites
crackback 135 Posted March 27, 2010 Author Report Share Posted March 27, 2010 (edited) You can't use this with a RR. Droooooooooool..... Nice! And that folks, may just be the best damn argument for the RDIAS route I've seen! Edited March 27, 2010 by 690gr Quote Link to post Share on other sites
KrisFox 69 Posted March 27, 2010 Report Share Posted March 27, 2010 You can't use this with a RR. Droooooooooool..... Nice! And that folks, may just be the best damn argument for the RDIAS route I've seen! As long as the RDIAS is in the lower the AFT doesn't care if I put a barrel under 16 inch on it. Quote Link to post Share on other sites
Azrial 1,091 Posted March 27, 2010 Report Share Posted March 27, 2010 There was a time that the drop in Auto Sear rifles were less desirable then the conversions, that is history, they are now considered as the way to go. All my AR that are Title II use this method. Quote Link to post Share on other sites
Shandlanos 1,470 Posted March 29, 2010 Report Share Posted March 29, 2010 A few pros and cons come to mind. On the plus side, you can spread the wear across many weapons, beating the shit out of them in full auto, instead of banging up your registered receiver. You can drop it into any modern platform set up to accept it, and legally circumvent the '86 sunset to some extent. On the other side of things, I've been told (and do correct me if I am wrong) that the AM-180 upper does not work with a DIAS because it is an open-bolt upper and uses a different FCG. I've also been told that setting up a DIAS for select fire instead of auto-only is a pain in the ass. Another potential minus, it seems to me that a DIAS is a more fragile item than an AR receiver, or that at least it sees more dramatic wear during firing. I've seen how beaten up FCG parts get after being slammed around in full auto for a long time, but I've never seen with my own eyes what a DIAS looks like after 10k rounds. Anyone with hands-on experience who can comment? Quote Link to post Share on other sites
KrisFox 69 Posted March 29, 2010 Report Share Posted March 29, 2010 A few pros and cons come to mind. On the plus side, you can spread the wear across many weapons, beating the shit out of them in full auto, instead of banging up your registered receiver. You can drop it into any modern platform set up to accept it, and legally circumvent the '86 sunset to some extent. On the other side of things, I've been told (and do correct me if I am wrong) that the AM-180 upper does not work with a DIAS because it is an open-bolt upper and uses a different FCG. I've also been told that setting up a DIAS for select fire instead of auto-only is a pain in the ass. Another potential minus, it seems to me that a DIAS is a more fragile item than an AR receiver, or that at least it sees more dramatic wear during firing. I've seen how beaten up FCG parts get after being slammed around in full auto for a long time, but I've never seen with my own eyes what a DIAS looks like after 10k rounds. Anyone with hands-on experience who can comment? DIAS are often stronger than the RR if the DIAS has a steel body. The only part on a DIAS that can wear down is an auto trip. Since the trip is not a numbered part you can make replacements. A properly heat treated auto trip will last 20,000+ rounds. A steel DIAS body will last longer than you. The cost difference between an aluminum DIAS body and a Steel one is 1-2k. I have yet to see an aluminum DIAS body that was beyond repair. I seen one with egged out trip pin holes, the owner drilled it and installed steel bushings. Quote Link to post Share on other sites
Shandlanos 1,470 Posted March 31, 2010 Report Share Posted March 31, 2010 Thanks for the quick, knowledgeable answer. Do you know anything about setting up a DIAS for select fire? Quote Link to post Share on other sites
belt fed frog 56 Posted March 31, 2010 Report Share Posted March 31, 2010 go over to quarterbore com they have the info you seek Quote Link to post Share on other sites
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