Albroswift

5/64, not 5/32!

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

I only have 3 barrels stacked up right now, so I guess I'm the lucky winner!

I just PM'd him but go ahead, it's yours.

Most of my money I spend on guns, cars, and women, the rest I just waste, someone once said...

But no cycling issues with the rifle length gas system and 27.5 grains, correct? So you hit upon a load that has enough pressure to operate the longer gas system but not enough to maintain acceleration much past it. Out of curiosity, total waste of time, but it would be interesting to ladder up 27.6, 27.7, 27.8...keep going up 0.1 gr at a time until the 18" velocity passed the 16" with the original 27.5 gr. Then go the other way with the 16" until it was slower then the 27.5 in the 18". Could tell a lot about that powder characteristic. Or not.

I'm surprised you didn't get anyone to argue with that statement! Hitting maximum speed at 16" and loosing speed for 2" is unusual for sure. I would expect a huge SD if that was happening. Curious if other factors were involved. For example, admittedly not apples to apples, but I can use some of the fastest burning pistol powders out there and bullets are still faster out of carbine length barrels over pistol length barrels. Yes, I'll admit I don't load or shoot that 6.5 caliber, still interesting...

Been keeping a list of purchased items starting this year or so and prices. I know I've missed a few things, and didn't count multiple purchases of the same item. Crazy, Huh? Primary Arms No WSST Aero Precision Stripped AR-15 Upper Receiver $59.99 Strike Industries AR Enhanced Lower Receiver Parts Kit - No FCG $39.99 Anderson Manufacturing AR-15 Upper Parts Kit ***This item received a discount because it was purchased with AP501603. $19.99 Anderson Manufacturing 6061 Aluminum Charging Handle $13.99 KAK Industry 5/8" Crush Washer - 5/8x24 $3.99 ALG Defense Quality Mil-Spec Trigger - QMS $49.00 Radian Weapons Talon Ambidextrous Safety Selector 2-Lever Kit $47.95 ArmaLite 8" GI-Pattern AR-308 Carbine Receiver Extension $46.63 Precision Defense 5.56 Complete M16 Bolt Carrier Group - Nitride $59.99 Radical Firearms Low Profile Gas Block - .750" - Set Screw Style $9.99 SBA3 Pistol Brace $79.00 Midway AR-STONER Receiver Extension Buffer Tube End Plate Ambidextrous Sling Loop AR-15, LR-308 Carbine Matte $3.99 Daniel Defense Pistol Grip AR-15, LR-308 Polymer $29.00 DPMS Pistol Grip Panther-Style AR-15, LR-308 Synthetic Black $29.99 AR-STONER Pistol Grip Screw washer $1.79 AR-STONER Pistol Grip Screw $1.79 KNS Hammer and Trigger Pin 2nd Generation, 2nd Modification Non Rotating AR-15 Small Pin .154" Stainless Steel $27.00 ALG Defense ACT Advanced Combat Trigger Group AR-15, LR-308 Small Pin .154" Single Stage Matte $69.00 Yankee Hill Machine AR-15 EZ Pull Takedown Pin Set Steel Matte $15.00 AR Stoner receiver extension lock ring Castle Nut $3.79 EBAY 9" Mid-Length Tube Free Float Handguard For 223 Knurled US Seller $29.95 Blade Pistol Stabilizer Kit Extension Tube Kit Black/Blue/Gold/Green/Red $44.99 Pistol Buffer Tube $11.99 7 INCH Tube Free Float Round Handguard Knurled Non-slip for .223/5.56 $21.00 MFT Mission First Tactical Battlelink Adjustable Minimalist Stock Mil-Sp $20.49 Selmark Sightmark LoPro Mini Green Laser Sight $119.99 Sightmark R Spec reflex sight $129.99 SS Muzzle Brake5.56 $26.00 JBO No WSST Doublestar AR-15 Oops Replacement Kit - AR791 $9.95 CMC Triggers AR-15 Lower Assembly Kit - No Fire Control Group or Grip $29.95 Kaw Valley Precision AR-15 Solid Stainless Steel Blowback Buffer - 7.5oz [Optional Buffer Spring:INCLUDE KVP Extra Power Buffer Spring] $39.95 C-Products 308/7.62 LR308/SR-25 Stainless Steel Magazines - 10 Round $21.95 Kaw Valley Precision AR-15 Tungsten Blowback Buffer - 10oz [Optional Buffer Spring:INCLUDE KVP Extra Power Buffer Spring] $59.95 C-Products 308/7.62 LR308/SR-25 Stainless Steel Magazines - 20 Round $21.95 Kaw Valley Precision AR-15 4.5" 40S&W 4150 QPQ AR-15 Barrel [Charging Handle:INCLUDE JBO Forged Charging Handle] [Muzzle Device:INCLUDE 5/8x24 KVP XL Jumbo Linear Comp] $126.85 BLACKHAWK! AR-15 Ergonomic Grip by ERGO - OD - OEM $7.95 Kaw Valley Precision AR-15 Solid Stainless Steel Blowback Buffer - 7.5oz $34.95 Strike Industries Multi-Function End Plate and Anti-Rotation Castle Nut $26.95 Gas block $19.95 Adjustible gas block $29.95 Buffer H1-H3 $10.00 Buffer 5.8 oz 2-1/2" $25.00 Adaptive Tactical EX Performance Adjustable MILSPEC Stock w/ Buttpad $24.95 Kaw Valley Precision AR-15 16" 40S&W 4150 QPQ AR-15 Barrel $80.00 Vortex Viper PST GEN II 1-6x24 VMR-2 MRAD Reticle $600.00 Vortex 30mm Standard Duty Cantilever Mount - 2in Offset - CM202 $90.00 Aero upper Receiver built $79.99 Anderson Striped Upper $44.99 Anderson Stripped Upper w/ CH, UPK, Toolcraft BCG $151.75 Carbine Gas Tube $9.95 Stern Defense No wsst 40SW BOLT REPLACEMENT KIT $29.99 SD BU40 ORIGINAL 40 S&W Blowback BCG $142.65 Bens Classic Arms Glock .40 Cal 31 Rd Capacity Mag. Steel Lined and Reinforced Polymer Body Aftermarket Mag Glock High Cap 31 Round Mag by SGM Tactical for Glock .40 Cal Pistols ROG Tactical No WSST EOTech 512 Red 68 MOA Ring/1 MOA Dot $389.99 Spike's Tactical Forged 9MM Upper Receiver $103.50 5D Tactical no WSST Router Jig PRO Tool Kit [Choose ReadyMILL Size:B] $54.99 Glock Style AR-9 Billet 80% Lower - 6061 - Black Anodized $119.99 The AR-15/AR-9 Router Jig PRO - Universal 80% Lower Receiver Jig $199.99 308 Adapter $59.00 Damage Industries no WSST BCG ejector kit $3.95 DSG Arms no WSST Armalite AR10 Operating Buffer Spring $8.00 Armalite AR10 Carbine Buffer Tube 8" GI $42.00 MAGPUL MOE SL Carbine Stock Commercial Model - Black $51.26 MAGPUL PRS Extended Rubber Butt-Pad for AR15/308 $12.78 Vortex 1-6x24 PST G2 w/ Switchtrrow $539.00 Sig Sauer SB15 Pistol Stabilizing Brace Kit Reg 239 on sale for 75 +tax + shipping $94.00 Brownells VORTEX VMX-3T MAGNIFIER $199.99 Anderson Manufacturing no WSST Lower Parts Kit - Stainless Steel Hammer and Trigger [Retail Packaged] × 1 $46.88 AM-15 Charging Handle - 6061 × 1 $12.84 LowPriceGuns.com Spikes 9mm lower $149.00 Anderson Lower $69.00 Aero M4E1 Lower $95.00 Tromix No WSST 458 socom upper 14"-16" Pinned Barrel 12" free float tube $920.00 458 case gauge $45.00 Seekins Precision Adjustible gas block $59.00 Extended 308 Aero Precision mag release button $4.75 CDNN No WSST SIG SAUER 716 12.5IN 7.62 NATO CHROME LINED BARREL $49.99 SIG SAUER M400 16" NON THREADED BARREL $49.99 SIG SAUER 716 BOLT CATCH (SIG716 ONLY) $6.99 AR 308 BOLT CATCH AND SCREW $6.99 Milspec Trigger $19.99 308 Charging Handle $14.99 Primary Arms No WSST Aero Precision Stripped AR-15 Upper Receiver $34.15 Strike Industries AR Enhanced Lower Receiver Parts Kit - No FCG $33.97 DeltaTeamTactical.com No WSST DPMS 308 stripped upper $79.00 Gorilla Machining No WSST No shipping? AR15 Striiped Upper Blem $26.00 WCArmory No WSST Toolcraft NiB 308 BCG $139.00 Outdoor Emporium Aero Precision Gen 2 AR15 lower including Seattle fee and tax $102.00

Thanks for the tip, see what you are saying. Taking really small steps, .025 ea pass.

Got one for me?

.062 not quite enough, ran a few rounds in the basement, feeds and ejects now but still no LRBHO, going to .078

port looks a little rough, I'll run an O/S through it last.

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

Yes, saw that, thanks. Have a couple of new cobalt bits in that size range ordered. (I'm pretty sure I would just break off my 1/16 reamer if I tried that) Practice on the barrel with the broken mill bit first I guess. I'm thinking driving a slug into the barrel before drilling, but maybe go slow and easy no need. Worried about that tiny bit grabbing when it breaks through the bore. Maybe we are getting to the reason Sig dumped these barrels! Thanks.

Ditto, couple small parts, stripped 308 upper, no problema also had good CS from DD lately, tiny screw lost sent another one no questions, N/C, maybe they are upping their game. Maybe not, maybe I just got lucky

PS tried a really tight fitting gas block, same short stroke issue. these photos with the PA block. port go .052 no go. 055

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!

post, then edit, picture upload works when editing. that's how I've been posting photos for 2 or 3 days now

guess I'm going to be right behind you. Did you end up with 11-1/8"?

dimpled the barrel, tightened down the gas block, installed barrel and 12-1/16 tube. Marked center of cut out. Exactly 7/8". 11-3/16" tube it is.

Three 80% millings done so far, a "Cheapest on the internet" AR15 Anodized Forged 7075 for practice, a 9MM Anodized Billet 6061-T6 from 5D, and a 308AR Anodized Billet 7075 T6 from American Made Tactical. They all milled cleanly, but the AMT 308 slightly cratered the 3 drilled holes (Safety and FCG) . Like a little ridge around the hole. Not sure if it was the 7075 aluminum, anodizing, or ? but pretty sure the drill bits are not to blame, like new. Also had a heck of a time punching the holes through, bits grabbing like nobody's business. Didn't have that problem on the other 2. Using an aluminum cutting fluid, maybe go back to WD 40 for drilling.

It seems like I can't post a photo, "Loading" down by the paperclip stays like that for as long as I want to wait. but if I post, then edit, no problem with photo. Just be fast.

Thanks. The first 5.56 sig barrel w/ stripped toolcraft BCG go gauge fit, no go was not even close. Then proceeded to shoot the ejector and spring across the shop, heard it hit something, think it went out the door after that. Then proceeded to perform the same operation again except out the window, nothing but net. I've assembled bolts before without any special tools, but fingers aren't as nimble as they use to be, time to order a n assembly tool I guess... Anyway, tried to cycle some live ammo next, reloads that function fine in both Colts (and fit the case gauge) were really tight/ sticky/ difficult to extract in the Sig barrel, but bulk factory ammo was fine. Range Sunday hopefully.

Dsg arms MRAD or MOA PST GEN 2 1-6×24 with the switchview lever $539 no tax free 2 day shipping. Think I paid $599 and another $50 for the lever a while back. Don't ask why I was looking.

Looking online I see .223 Go-Nogo, .223 min max, 5.56 go- nogo, 5.56 min max, and one set that is labeled ".223-5.56" min max but both have the 1.436 dim?. (Plus the associated field gauge Absolute no go?) Is there any difference between the 556 and the 223 SPECIFICALLY when it comes to these gauges?