jtallen83 Posted September 14, 2015 Report Share Posted September 14, 2015 What do I need for tools and bits to drill out an undersized gas port? Any specifics I should look for on the bits or will any decent quality bits work? Once drilled is there a deburring procedure or can I just send a few rounds through to smooth it out? Quote Link to comment Share on other sites More sharing options...
sketch Posted September 14, 2015 Report Share Posted September 14, 2015 This is a good ? Ive thought about the burr ? As well after many threads here. As for bits i wouldnt go cheep and defitnetly a steel specific grade! Slow and steady? Quote Link to comment Share on other sites More sharing options...
Matt.Cross Posted September 14, 2015 Report Share Posted September 14, 2015 (edited) What do I need for tools and bits to drill out an undersized gas port? Any specifics I should look for on the bits or will any decent quality bits work? Once drilled is there a deburring procedure or can I just send a few rounds through to smooth it out?My gas port measures .093" which translates to a #43 drill (number drills, not fractional). Edited September 14, 2015 by Matt.Cross Massive error Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted September 14, 2015 Author Report Share Posted September 14, 2015 My gas port measures .093" wwhich translates to a #8 drill (number drills, not fractional). A #8 measures .0925" but any drill will "walk" and drill slightly oversize by a few thou.What type barrel is that port size on? I have a 16 inch rifle gas that I think needs more umph. Quote Link to comment Share on other sites More sharing options...
Matt.Cross Posted September 14, 2015 Report Share Posted September 14, 2015 Mid-weight profile, 18.5" rifle length gas system. Quote Link to comment Share on other sites More sharing options...
MikedaddyH Posted September 14, 2015 Report Share Posted September 14, 2015 Slow the f... Down ! First length of barrel Second length of gas systemThird rifle caliber I have a chart that I made up just need to find it !Matt that drill bit number make NO sense.#41 ~.094" for rifle gas and 24" barrel? Quote Link to comment Share on other sites More sharing options...
MikedaddyH Posted September 14, 2015 Report Share Posted September 14, 2015 Look at the thread I have a AR-10T that short cycles ......I gave it CPR and it went to the top. Has some sizes on the second page Dane Armory post. Quote Link to comment Share on other sites More sharing options...
MikedaddyH Posted September 14, 2015 Report Share Posted September 14, 2015 What do I need for tools and bits to drill out an undersized gas port? Any specifics I should look for on the bits or will any decent quality bits work? Once drilled is there a deburring procedure or can I just send a few rounds through to smooth it out?Run a couple of cloth swabs through the tube to make sure metal is out. Should be GTG shoot. Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted September 14, 2015 Author Report Share Posted September 14, 2015 Looks like a 7/64 (.1094) gets me a match for the Fulton Armory rifle length gas system on a 16 incher(.1095). I've got that already. I think I'll set up in a drill press so I can control the depth for sure! Hope this works, she felt smooth the way it was but then that was without much buffer or carrier movement:) Quote Link to comment Share on other sites More sharing options...
Matt.Cross Posted September 14, 2015 Report Share Posted September 14, 2015 (edited) Matt that drill bit number make NO sense.#41 ~.094" for rifle gas and 24" barrel?You're right on, #43 is what I should've said. I'll fix my post quicklike. I am stupid tired ATM, shouldn't be posting anyways... LOL Edited September 14, 2015 by Matt.Cross Quote Link to comment Share on other sites More sharing options...
Robocop1051 Posted September 14, 2015 Report Share Posted September 14, 2015 My 17", rifle length gas, .308 has a .099" hole. You max out at .125" Quote Link to comment Share on other sites More sharing options...
shepp Posted September 14, 2015 Report Share Posted September 14, 2015 (edited) Maybe look for wood dowel to fit inside so just I case it does slam thru u don't damage the rifling??? Edited September 14, 2015 by shepp I suck at grammar Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted September 14, 2015 Author Report Share Posted September 14, 2015 Had one laying around in case of a squib load. Now it looks like X-Caliber may want the whole upper to diagnose the issue...not sure what to do now! Quote Link to comment Share on other sites More sharing options...
Malig8r Posted September 15, 2015 Report Share Posted September 15, 2015 JT, if it were me I would send them the upper. I know it would be cool to figure this out yourself but look at it this way. If they screw it they have to fix it on their dime. If you screw it up you eat the cost. Don't get me wrong, I'm all for almost any excuse to buy new tools but in this case I'd let them diagnose the issue & then have em tell ya what was wrong so if something similar ever happens you can then move forward with rectifying it.Either way, I am sure we would all like the know the path you choose and the results. Quote Link to comment Share on other sites More sharing options...
Rsquared Posted September 15, 2015 Report Share Posted September 15, 2015 Either way, I am sure we would all like the know the path you choose and the results.Nahh! I don't care. Just kidding JT Quote Link to comment Share on other sites More sharing options...
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