DNP Posted August 12, 2019 Report Share Posted August 12, 2019 Guys here usually run a wood dowel down the barrel. Gives you a nice cushion when you break through. Quote Link to comment Share on other sites More sharing options...
shooterrex Posted August 12, 2019 Report Share Posted August 12, 2019 On 8/10/2019 at 8:54 AM, jtallen83 said: How much cheaper? I have a 7.62 marked barrel that may need the same length, I haven't mocked it up yet. Wishing I would have just gotten two of the 308 marked barrels so I could have all the same length......hindsight and all. Just ordered 3. Bill is in 4 one. I have one more available. PM for details. Quote Link to comment Share on other sites More sharing options...
Albroswift Posted August 12, 2019 Author Report Share Posted August 12, 2019 (edited) ran a .062 through the .052 on the test barrel, clean punch through. have a .078 showing up any time, try that next, in the .062 hole. going to face the hole with a very small mill, surface of the barrel hard. Got the broken mill out of the test barrel, the hole cleaned up nicely, back to the mill soon Edited August 12, 2019 by Albroswift photos Quote Link to comment Share on other sites More sharing options...
Albroswift Posted August 12, 2019 Author Report Share Posted August 12, 2019 port looks a little rough, I'll run an O/S through it last. Quote Link to comment Share on other sites More sharing options...
Albroswift Posted August 13, 2019 Author Report Share Posted August 13, 2019 .062 not quite enough, ran a few rounds in the basement, feeds and ejects now but still no LRBHO, going to .078 Quote Link to comment Share on other sites More sharing options...
Albroswift Posted August 13, 2019 Author Report Share Posted August 13, 2019 5 hours ago, shooterrex said: Just ordered 3. Bill is in 4 one. I have one more available. PM for details. Got one for me? Quote Link to comment Share on other sites More sharing options...
shooterrex Posted August 13, 2019 Report Share Posted August 13, 2019 57 minutes ago, Albroswift said: Got one for me? PM sent Quote Link to comment Share on other sites More sharing options...
willbird Posted August 13, 2019 Report Share Posted August 13, 2019 On 8/11/2019 at 2:15 PM, Albroswift said: Range report 16in non threaded 5.56 Shot nice groups Romeo5/ VMX 3T great combination but under gas symptoms even using lightest buffer lightest spring bcg would set the disconnect/hammer and ejected 100% nicely but not enough travel to reliably lock back or strip next round. I'll strip it down and take a look maybe the gas block/ gas tube not sealing. On another note, started cutting a comp in one of the barrels, first slot came out nice stuck and broke bit in second slot. Learning curve. New bit ordered. Need a CNC! Just in a general way I typically try not to say make a 3/8" slot with a 3/8" endmill....just from my experience both cnc and conventional they get upset when they are wedged into a slot, cannot think of a better way to say it :-). They will pull depending on direction of cut, if you had a 3/8 in there I'd use a 1/4 and walk it around ...if we were doing cnc we would roll out the radii on the end..manual we just make it a rectangle with really big corner fillets :-). Roughers also help a lot, you can bury them deep and they do not start to chatter and shriek :-)...but they need a finish pass after to make things pretty. Bill Quote Link to comment Share on other sites More sharing options...
Albroswift Posted August 13, 2019 Author Report Share Posted August 13, 2019 (edited) Thanks for the tip, see what you are saying. Taking really small steps, .025 ea pass. Edited August 13, 2019 by Albroswift Quote Link to comment Share on other sites More sharing options...
Albroswift Posted August 14, 2019 Author Report Share Posted August 14, 2019 OK, the 16in 223 barrel needs a 5/32" gas port, mine started with a .053+/-, no feed did not strip the round from the mag at all. Drilled a 1/16" .062, fed and ejected the rounds but no LRBHO. Drilled a 5/32" .078 LRBHO has been achieved. Used Dewalt cobalt bits. the first few thou is pretty discouraging, hard as hell, went real slow, that's where the bit may grab. Easy drilling rest of the way home. If you could dremel out the top few thousandths I think even HSS drills would cut. no mushrooms in the bore with the cobalt bits. very clean. 2.9+/- oz buffer, Millspec? black carbine spring Quote Link to comment Share on other sites More sharing options...
Albroswift Posted August 15, 2019 Author Report Share Posted August 15, 2019 5/64, not 5/32! Quote Link to comment Share on other sites More sharing options...
Albroswift Posted August 16, 2019 Author Report Share Posted August 16, 2019 308 12.5 in barrel does not have the same hard coating of the 223 barrels. Port was .062 opened it up to .078 soft as butter. same bit, hadn't even taken it out of the press. There is some weird $hit going on with these barrels. Not complaining, just observing! Installing the 308 barrel, bent the pins on my barrel wrench, went from 10 ftlbs to 80 in about 1/2 a hole, no joy on gas tube alignment. ordered a new wrench and some spacer shim washers. Quote Link to comment Share on other sites More sharing options...
Albroswift Posted August 17, 2019 Author Report Share Posted August 17, 2019 (edited) Range day with the first 223 build. Cycled flawlessly. Good groups at 100 yards. Have everything in hand or ordered for the 12.5" 308 and a second 223. Viper PST optics. Edited August 17, 2019 by Albroswift add photos Quote Link to comment Share on other sites More sharing options...
shooterrex Posted August 18, 2019 Report Share Posted August 18, 2019 (edited) Don't think white oak made the gas tubes this week. They haven't charged my credit card yet. Edited August 18, 2019 by shooterrex fat fingers Quote Link to comment Share on other sites More sharing options...
Albroswift Posted August 19, 2019 Author Report Share Posted August 19, 2019 (edited) No problem, have a temp gas tube already, and plenty of other projects... Worked on the porting on one of the 223 sig barrels today. Think maybe I'll add a popple hole, maybe some polish and bluing. Edited August 19, 2019 by Albroswift Quote Link to comment Share on other sites More sharing options...
willbird Posted August 19, 2019 Report Share Posted August 19, 2019 That looks really nice :-). Quote Link to comment Share on other sites More sharing options...
DNP Posted August 19, 2019 Report Share Posted August 19, 2019 Very cool. Looking forward to seeing it run. Quote Link to comment Share on other sites More sharing options...
Albroswift Posted August 19, 2019 Author Report Share Posted August 19, 2019 "Don't quit your day job" Had a good 4-5 hrs of spinning hand wheels back and fourth on an old, non DRO mill. Unlock X, spin, lock. Unlock Y, spin, lock. Unlock X, spin the other direction + .020 backlash, lock. unlock Y, spin the other direction + .060 backlash, lock. Unlock Z, down .030, lock. Repeat the whole process 25 times or so. Had to stop a couple times and let the spindle bearing cool off and pump some more grease in it. (and refill the adult beverage) Rifling and outside of barrel harder then heck. Fun project but wouldn't do it again w/o modern equipment. Quote Link to comment Share on other sites More sharing options...
DNP Posted August 19, 2019 Report Share Posted August 19, 2019 So, early apology for the ignorant question...do you open up the barrel a touch after that first exit hole? Quote Link to comment Share on other sites More sharing options...
392heminut Posted August 20, 2019 Report Share Posted August 20, 2019 3 hours ago, DNP said: So, early apology for the ignorant question...do you open up the barrel a touch after that first exit hole? I was just thinking the same thing! Quote Link to comment Share on other sites More sharing options...
Albroswift Posted August 20, 2019 Author Report Share Posted August 20, 2019 Yes, and what a pain! Just did it after work tonight. Barrel wasn't long enough to put in the lathe, through hole too small for barrel extension. So up through the bottom of the drill press table, spun a piece of rod in the lathe that just fit the bore to align the bore with the chuck. That worked out pretty good. Clamped everything down and put a brand new .250 cobalt bit in. Squeeled like a little girl but wouldn't cut. Set the belts to high speed as it would go, put a solid carbide 1/4" end mill in, still squealed a bit but cut nicely. deburred with the dremel and a chain sharpener bit. Think I mentioned before these barrels are some hard ass $hit I may wait on the popple holes Quote Link to comment Share on other sites More sharing options...
Albroswift Posted August 20, 2019 Author Report Share Posted August 20, 2019 (edited) Pics. Didn't get to the edit fast enough I guess Edited August 20, 2019 by Albroswift Quote Link to comment Share on other sites More sharing options...
willbird Posted August 21, 2019 Report Share Posted August 21, 2019 From time to time I have been wedged into a corner at work and needed to open up a hole in case hardened steel. Mouth breathing people who design stuff decide "yea lets make this part as hard as the hinges of hell for no actual reason". The one tool that might surprise you is this one. Not the first thing on the table by any means, but when you end up "whut the eff am I gonna DO?" if you have a good setup and be careful to not over heat it (the end is brazed on and will fall right off if you get it hot enough) it will open up an existing hole in some stuff so hard that every other cutting tool ended up destroyed :-). Just line it up perfect and shoot it straight in there at maybe 750 RPM or so (just guessing). I'm guessing the barrels are Nitride and the surface is really hard (which is good). Bill Quote Link to comment Share on other sites More sharing options...
Albroswift Posted August 24, 2019 Author Report Share Posted August 24, 2019 Shot the 308 pistol and the ported 223 this morning. 308 is a madman, really blast to shoot-- the gravel pit ain't going to know what hit it. 80% lower, 11-3/16" gas tube cut, necked, and bent from a straight rifle length tube, no name $89 upper, Seekins adjustable block, Toolcraft NiB BCG, ebay ebay CDNN. Radian Talon safety. (Splurged on the BCG and the safety!) 110% reliable, zero issues. Ported 223 had noticeably less recoil, quicker back on target then the non ported, even with the lighter hand guard. Seemed like less muzzle rise as well, maybe my imagination. AR308 pistol build Parts Check list Muzzle Device Ebay Barrel Sig Sauer 716 12.5" 1:10 Handguard/ Barrel Nut Ebay Upper Receiver DeltaTeamTactical DPMS Lower Receiver 80% Lower Upper Receiver Parts Kit CDNN Lower Receiver Parts Kit/ Pistol Grip CDNN/ Ebay Fire Control Group CDNN Charging Handle CDNN Bolt Carrier Group Toolcraft NiB WC Armory Buffer Tube Pistol Buffer Tube Adjustible Armalite 7-5/8" Buffer Tube Rifle Buffer Spring Tubbs Flat Wire Spring Buffer 2-1/2" X 5.8 oz KVP EXTENDED to 3.25" End Plate Stock Castle Nut Stock Pistol Brace SBA3 Carbine Stock Rifle Stock Gas Tube Special Cut and necked from a straight 15" Gas tube 12-1/16 AR 10 Mid Gas Tube Rifle 15-1/8 Gas tube Pistol 6-5/8 Gas Tube Mid Length 11-3/4 Gas Block Seekins Optic Sig Romeo5 Quote Link to comment Share on other sites More sharing options...
jtallen83 Posted August 24, 2019 Report Share Posted August 24, 2019 Excellent news So glad you were able to replicate the shorty results I had! Now you just need a can on that thing and a schit pile of ammo! I took my Sig 716 out this afternoon and got the crap beat out of my shoulder compared to the DI version. I am going to take both versions out tonight and see if it was just my imagination. Also noticed a good case of gas face that I don't recall with the DI version, this should be the opposite in both respects according to traditional opinion. Still gotta get this gas tube length difference figured out, hate to strip down my built shorty but really want to see the differences. @Albroswift got a picture of you gas tube end in the cut out? Quote Link to comment Share on other sites More sharing options...
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.