ChaseFan9 Posted May 28, 2015 Report Share Posted May 28, 2015 (edited) Several guys here have built off Matrix Aerospace receivers (the manufacturer of Ruger's receivers) and run into the same issue; the rear takedown detent spring is too short. I don't own an SR762 or I'd do it myself, but can anyone check and see how Ruger solved this problem? Edited May 28, 2015 by ChaseFan9 Quote Link to comment Share on other sites More sharing options...
survivalshop Posted May 28, 2015 Report Share Posted May 28, 2015 Look at post # 35 , this is one way , some drill& tap for a set screw . Check out the rest of this thread. Quote Link to comment Share on other sites More sharing options...
ChaseFan9 Posted May 28, 2015 Author Report Share Posted May 28, 2015 I know, SS, that's why I started this thread, just in case someone with a Ruger missed it. Since the SR762 and Matrix set are supposedly the same set, I want to see if Ruger tapped the receivers or just use a spacer, or if they're even drilled for the rear takedown detent in the rear instead of the bottom of the lower. Good looking out, though :) Quote Link to comment Share on other sites More sharing options...
98Z5V Posted July 12, 2015 Report Share Posted July 12, 2015 If this comes up again - Ruger SR-762 lower receiver is identical to the Matrix Aerospace M-762 lower receiver. I did this: I tackled the Matrix takedown spring area this way - cut a second spring and stacked them. i should have used a small washer to separate the two springs, but can't find a washer small enough. I doubt the springs will connect (spiral together at the ends) based in the amount of movement there is there. If they do, it's not a big deal, not a high-risk area. I figured I needed the spring to stick out as much as it does on any other AR15 build, which is about this much: I stacked the two springs together (detent and takedown pin in place), and just cut it off there. Looked right. Length on both springs, end-to-end: Didn't feel like drilling the lower to use a 6-32 set screw, so I just ran the 4-40 tap in the stock hole - no drilling required to run a 4-40, if you decide that. 4-40 set screw going in: Done: Quote Link to comment Share on other sites More sharing options...
blue109 Posted July 12, 2015 Report Share Posted July 12, 2015 The LPK I got from Chris with my matrix lower had a correct spring. Its about 1 15/16" long. Quote Link to comment Share on other sites More sharing options...
SaPPeR524 Posted January 19, 2016 Report Share Posted January 19, 2016 solid fix, I like it Quote Link to comment Share on other sites More sharing options...
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