Foxbat Posted November 5, 2014 Share Posted November 5, 2014 The question doesn't have to do with an open gun, but since here it is a common element, I decided to ask it on this forum. I would like to drill a couple of holes in an extended barrel. The question is - how do you deburr the holes inside the bore? Link to comment Share on other sites More sharing options...
kneelingatlas Posted November 5, 2014 Share Posted November 5, 2014 Ahhh just shoot it I've only used ball end mill bits and they poke through pretty clean. Link to comment Share on other sites More sharing options...
WhiteDingo Posted November 5, 2014 Share Posted November 5, 2014 (edited) Drill your initial hole undersized and then drill-ream with a straight flute carbide drill at high RPM; or use a reamer for that matter. You can drill-ream with a standard HSS or Cobalt (depends on the barrel steel; most factory Glock barrels will destroy standard bits) bit and it will work OK but I like the surface finish the high RPM carbide gives. Edited November 5, 2014 by WhiteDingo Link to comment Share on other sites More sharing options...
Foxbat Posted November 5, 2014 Author Share Posted November 5, 2014 Thank you guys! The barrel is 416 steel. Link to comment Share on other sites More sharing options...
bikerburgess Posted November 5, 2014 Share Posted November 5, 2014 You can also drive a lead bullet in to the barrel where you are drilling or you can fill the barrel with Cerrosafe (a low melting point alloy) Link to comment Share on other sites More sharing options...
siraig Posted November 5, 2014 Share Posted November 5, 2014 ^^ That is a really great idea... Link to comment Share on other sites More sharing options...
jid2 Posted November 5, 2014 Share Posted November 5, 2014 A straight flute carbide drill is magic. I have a video of a straight flute drill followed with a ball endmill. 1911 barrel holes on CNC milling machine - Barrel: Link to comment Share on other sites More sharing options...
andersonj55126 Posted November 5, 2014 Share Posted November 5, 2014 Some people put a wood dowel in barrel. Link to comment Share on other sites More sharing options...
turkeypoker Posted November 6, 2014 Share Posted November 6, 2014 Very nice Link to comment Share on other sites More sharing options...
skeeljc Posted November 15, 2014 Share Posted November 15, 2014 o.k I grew up when .45 comps were just one or two rather large ports. What is with drilling holes in the barrel ahead of the comp?? Seems to me you are only reducing the amount of gas available to the comp. Link to comment Share on other sites More sharing options...
cking Posted November 25, 2014 Share Posted November 25, 2014 I used a two flute ball end carbide end mill, and filled the barrel with cerrosafe. the stuff they use to cast chambers melts at 190 F and is tougher than lead. Barrel showed no burrs at all. When done warm barrel and comes right out. Link to comment Share on other sites More sharing options...
Graham Smith Posted November 25, 2014 Share Posted November 25, 2014 Since no one has mentioned this so far... Knowing where to drill the holes, what size, and what angle, is 80% of the job. Link to comment Share on other sites More sharing options...
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