Milspec Posted June 16, 2019 Share Posted June 16, 2019 I got my first M4 today! I just finished the basic out of the box assembly and I have a couple questions. 1.) My front sling plate has a lot of play, it wiggles. Is this normal? 2.) The bolt "cam like" pin (part #12 in manual page 162) has a small line cut partially in the top. I assume this is normal as this does not appear to be a defect. Quote Link to comment Share on other sites More sharing options...
Redweirdbeard Posted June 16, 2019 Share Posted June 16, 2019 Not sure about the sling but the mark on the pin is to help you put it back together. The mark goes towards the front of the bcg. 1 Quote Link to comment Share on other sites More sharing options...
Milspec Posted June 16, 2019 Author Share Posted June 16, 2019 1 hour ago, Redweirdbeard said: Not sure about the sling but the mark on the pin is to help you put it back together. The mark goes towards the front of the bcg. Thanks for the explanation. I figured it was meant to be. I have a few high end rifles and one has an odd cut out on the bolt face etc. On another forum people post about this bolt and they panic that it's messed up. We all get a chuckle because once every 4-6 months somebody will post a bolt picture. Quote Link to comment Share on other sites More sharing options...
Milspec Posted June 16, 2019 Author Share Posted June 16, 2019 Maybe I need to tighten/adjust the snap ring in front of the sling plate? Quote Link to comment Share on other sites More sharing options...
Scout_21 Posted June 17, 2019 Share Posted June 17, 2019 The front sling plate looseness is normal... at least for the ones I've handled. I've taken it off as I use a flashlight mount that has a qdc option for a sling 1 Quote Link to comment Share on other sites More sharing options...
Jolly Roger Posted June 17, 2019 Share Posted June 17, 2019 A bit of high temp black RTV silicone applied to the sling plate stops the rattle. Just take it off and clean it, put a little bit on with your finger and reassemble it with the snap ring. Center it with the barrel and let it set for a night. You can take a Q-Tip and rid any extra RTV that may squeeze out making for a nice tidy job. Its completely unnoticeable when done. Quote Link to comment Share on other sites More sharing options...
StrangerDanger Posted June 17, 2019 Share Posted June 17, 2019 All the M4 front sling plates have that play in them. The area that limits side to side wiggle is the cut out at the top that indexes against the barrel. The best fix is to dump it and get the IWC weapon light/sling mount. You'll have ambidextrous light and sling mounts on both sides in a low profile design. The bolt carrier cam pin has the line so you can index the hole the firing pin goes through. Which direction the line is in doesn't matter. Quote Link to comment Share on other sites More sharing options...
Evolution Posted June 18, 2019 Share Posted June 18, 2019 My forward sling plate never had any slop in it.Once the snap ring is installed in front of it there was no play fore and aft, it was tight to the point of having drag when I rotated it the eigth inch or so that is allowed due to the barrel cutout. Quote Link to comment Share on other sites More sharing options...
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