five six Posted January 15, 2012 Share Posted January 15, 2012 (edited) Recently put together a Ma-Ten upper/lower with a fulton armory barrel and BCG (headspaced by them), and while adjusting my PRI gas block I noticed some weird brass markings. I am using some dynamit nobel 7.62 nato ammo. The case has what appears to be 2 sets of perforations(like a perforations on your common pay stub) running vertically starting from the neck of the case. It only happens after shot, not when I load a round and eject it without firing. If I can provide any more info please let me know. Edited January 15, 2012 by five six Quote Link to comment Share on other sites More sharing options...
mpeltier Posted January 15, 2012 Share Posted January 15, 2012 You have a very nice oak table top there. Scince that's all that's in focus its hard to comment on the caseneck. Quote Link to comment Share on other sites More sharing options...
sparks1 Posted January 15, 2012 Share Posted January 15, 2012 Chamber has a burr? causing the "perforation" Spell check is at the top right corner. Quote Link to comment Share on other sites More sharing options...
RH45 Posted January 15, 2012 Share Posted January 15, 2012 Mine does that a little bit too. I really haven't looked in to it to determine if it is coming from the ramp, when loading, or, if it is scraping, when ejecting. Quote Link to comment Share on other sites More sharing options...
Mark Gale Posted January 15, 2012 Share Posted January 15, 2012 The feed ramps in your barrel extension needs to be de-burred! Quote Link to comment Share on other sites More sharing options...
five six Posted January 15, 2012 Author Share Posted January 15, 2012 The feed ramps in your barrel extension needs to be de-burred! How would I de-burr the barrel extension without screwing it up? Quote Link to comment Share on other sites More sharing options...
Coleman Posted January 16, 2012 Share Posted January 16, 2012 Take a marker and blacken the case and mark top of case, but in mag with top of case up and cycle by hand, it will show you which feed ramp/s need to be deburred. I used a small honing stone to deburr mine then followed by a cratex tip in the dremel to smooth it out better. watch the shank of the dremel so it dont hit the inside of the reciever. Quote Link to comment Share on other sites More sharing options...
Mark Gale Posted January 16, 2012 Share Posted January 16, 2012 The feed ramps in your barrel extension needs to be de-burred! How would I de-burr the barrel extension without screwing it up? You need to remove the barrel assembly from the upper receiver and use a Cratex cone to break the edges. Quote Link to comment Share on other sites More sharing options...
.gif.53c483221c1b60d84bce93d42c5def5a.gif)
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.